Volvo

Fault Condition: Code PID 412 will set with FMI 0 if the EGR ECU detects the exhaust gas temperature exceeds 365°F (185°C) for 30 minutes, 410°F (210°C) for 25 seconds or 455°F (235°C) for 3 seconds. Code PID 412 will set with FMI 3 if the EGR ECU detects a short circuit to voltage in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 4 if the EGR ECU detects a short circuit to ground in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 5 if the EGR ECU detects an open in the exhaust gas temperature probe circuit. Code PID 412 will set with FMI 9 if the EGR ECU signal is missing on the J1939 serial data lines.

Possible repairs:

Turn the ignition key OFF first.

1) If code PID 412 is NOT set, wiggle the harness and connectors to try to set the code. Visually inspect the exhaust gas temperature probe connector and wires for poor connections.
2) Check the Failure Mode Identifier (FMI) using a diagnostic computer. If the FMI is 0 (valid high), check for a faulty EGR cooler. If the FMI is 3 (voltage high/open) or 5 (current low/open), replace the EGR Mass Flow Sensor assembly and retest the system. If the FMI is 4 (voltage low), inspect the harness that connects the exhaust gas temperature probe to the EGR ECU and look for any areas where the insulation has worn through and is touching ground. Repair the short to ground if possible; otherwise, replace the EGR Mass Flow Sensor assembly.
3) Remove connector A from the EGR ECU. Turn the ignition key ON. Check for battery voltage (+12V) between pin 2 of EGR ECU connector A and a known good ground. If battery voltage is NOT present, a problem exists between EGR ECU connector A pin 2 and the power supply from the EMS Relay. Inspect the EGR ECU and EMS Relay connectors for damaged or loose pins. If the connectors are in good condition, locate and repair the open circuit, and retest the system.
4) Turn the ignition key OFF. Remove connector A from the EGR ECU. Measure the resistance between EGR ECU connector A pin 1 and a known good ground. If the measured resistance does NOT indicate acceptable continuity to ground, a problem exists between EGR ECU connector A and ground. Locate and repair the problem and retest the system.
5) Disconnect harness connector B from the Engine Management System (EMS) Module. Disconnect harness connector A from the EGR ECU. Measure the resistance between Engine Management System (EMS) Module
connector B pin 52 and EGR ECU connector A pin 3. If the measured resistance does NOT indicate continuity, locate and repair the open circuit in the J1939 circuit between the Engine Management System (EMS) Module and the EGR ECU.
6) Disconnect harness connector B from the Engine Management System (EMS) Module. Disconnect harness connector A from the EGR ECU. Measure the resistance between Engine Management System (EMS) Module
connector B pin 56 and EGR ECU connector A pin 6 . If the measured resistance does NOT indicate continuity, locate and repair the open circuit in the J1939 circuit between the Engine Management System (EMS) Module
and the EGR ECU.
7) Replace the EGR ECU and Mass Flow Sensor Assembly with a known good unit. Check the system for codes. If Code PID 412 is still set, reinstall the original EGR ECU and Mass Flow Sensor Assembly and replace the Engine
Management System (EMS) Module. Retest the system. If Code PID 412 is NOT set, replacing the EGR ECU and Mass Flow Sensor Assembly has corrected the problem.

Volvo All Engines (2004 Emissions) Fault Code: PID 49 FMI 9 ABS Status

Fault Condition: The ABS Status code will set when the EMS Module has lost the ABS Status Signal from the ABS ECU.

Possible repairs:

1)Verify that code PID 49 is set. If code PID 49 is not set, wiggle the harness and connectors to try to set the code. Visually inspect the ABS connectors and wires for poor connections.
2) Turn the ignition key off and connect a diagnostic computer. Turn the ignition key ON. Use the diagnostic computer to attempt to communicate with the ABS ECU.
If communication can be made with the ABS ECU, and there are no other codes, go to the Trouble Shooting Procedure for the ABS ECU.
If there is NO communication with the ABS ECU via the diagnostic tool, go to the Trouble Shooting Procedure for the Data Lines.

Circuit Description:

1) The J1587 and J1939 serial data lines are used as standard communication link for on-board vehicle insturmentation and off-board service diagnostics and fleet management. The ABS ECU is linked to the EMS Module via these data lines.

Fault Condition: The AC System Status code will set when the Engine Management System (EMS) Module has lost the AC Status ON/OFF Signal from the Vehicle Electronic Control Unit (VECU).

Possible repairs:

1) Verify that code PID 50 is set. If code PID 50 is not set, wiggle the harness and connectors to try to set the code. Visually inspect the VECU connectors and wires for poor connections.
2) Is code MID 144 PID 84, 86, 91 or PSID 8, 9 is set?
If other code(s) MID 144 PID 84, 86, 91 or PSID 8, 9 is set, repair the code(s) MID 144 PID 84, 86, 91 or PSID 8, 9 first then retest the system.
If only MID 128 PID 50 is set, a software problem in the Vehicle Electronic Control Unit (VECU) may exist. Reflashing the Vehicle Electronic Control Unit (VECU) may correct the problem, call MACK Reliability Engineering.

Circuit Description:

The J1587 and J1939 serial data lines are used as the standard communication link for on-board vehicle instrumentation, off-board service diagnostics and fleet management. The vehicle electronic control unit (VECU) is linked to the Engine Management System (EMS) Module via these data lines.

Fault Condition: The Cruise Control Status code will set when the Engine Management System (EMS) Module has lost the Vehicle Speed Status Signal from the Vehicle Electronic Control Unit (VECU).

Possible repairs:

1) Verify that code PID 85 is set. If code PID 85 is not set, wiggle the harness and connectors to try to set the code. Visually inspect the VECU connectors and wires for poor connections.
2) Is code MID 144 PID 84, 86, 91 or PSID 8, 9 is set?
If other code(s) MID 144 PID 84, 86, 91 or PSID 8, 9 is set, repair the code(s) MID 144 PID 84, 86, 91 or PSID 8, 9 first then retest the system.
If only MID 128 PID 85 is set, the Vehicle Electronic Control Unit (VECU) may be faulty, call MACK Reliability Engineering.

Fault Condition: The Pedal Message code will set when the Engine Management System (EMS) Module has lost the Accelerator Pedal Sensor Signal from the Vehicle Electronic Control Unit (VECU).

Possible repairs:

1) Verify that code PID 91 is set. If code PID 91 is not set, wiggle the harness and connectors to try to set the code. Visually inspect the VECU connectors and wires for poor connections.
2) If code MID 144 PID 91 is set, repair code MID 144 PID 91 and retest the system. If only MID 128 PID 91 is set, the Vehicle Electronic Control Unit (VECU) may be faulty, call MACK Reliability Engineering.

Fault Condition: The Electronic Malfunction Lamp (EML) will illuminate when the Fuel Pressure (FP) Sensor signal line voltage is less than 0.3 volts or greater than 4.75 volts. Ifthe signal line voltage returns to between 0.3 volts and 4.75 volts the fault will become inactive.

Possible repairs:

Turn the ignition key OFF first.

1) Disconnect Engine Management System (EMS) Module connectors B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and a good ground. If continuity exists, locate and repair the short circuit to ground.
2) Disconnect Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 1 (reference voltage line) and EMS Module harness connector B pin 17.
If there is NO continuity, repair the open in the harness reference voltage line.
3) Disconnect the Fuel Pressure (FP) Sensor. Disconnect Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 16 (signal line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 16 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the signal line. If there is NO continuity or visual short, replace the EMS Module.
4) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and EMS Module harness connector B pin 16. If there is NO continuity, repair the open in the harness signal line.
5) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity, visual short or loose, corroded and damaged terminals, replace the EMS Module.
6) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity or visual short circuit, replace the EMS Module.
7) Visually inspect both sides of the Fuel Pressure Sensor connector for a repairable open. If any of the pins feel loose or an open is found, replace the Fuel Pressure (FP) Sensor.
8) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 18 (ground line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 18 for a short circuit. If continuity exists or if there is a visual short circuit, repair the short to the return line. If there is NO continuity or visual short circuit, replace the EMS Module.
9) Visually inspect both sides of EMS Module connector B pin 11 for a repairable open in the signal line. If a repairable open is found, repair or replace EMS Module harness connector B.
10) Remove the Fuel Pressure (FP) Sensor. Connect the Fuel Pressure (FP) Sensor to a regulated air supply with an accurate pressure gauge. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 1 and pin 1 on the
sensor harness connector. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 4 and a good ground. Turn the ignition key ON. Measure the voltage between Fuel Pressure (FP) Sensor pin 2 and a good ground at
various pressures between 0 psi and 101.5 psi.
11) Visually inspect both sides of EMS Module connector B pin 18 for a repairable open in the ground line. If a repairable open is found, repair or replace EMS Module harness connector B. If the pin is making good contact, replace the EMS Module.

Fault Condition: The Electronic Malfunction Lamp (EML) will illuminate when the Fuel Pressure (FP) Sensor signal line voltage is less than 0.3 volts or greater than 4.75 volts. Ifthe signal line voltage returns to between 0.3 volts and 4.75 volts the fault will become inactive.

Possible repairs:

Turn the ignition key OFF first.

1) Disconnect Engine Management System (EMS) Module connectors B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and a good ground. If continuity exists, locate and repair the short circuit to ground.
2) Disconnect Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 1 (reference voltage line) and EMS Module harness connector B pin 17.
If there is NO continuity, repair the open in the harness reference voltage line.
3) Disconnect the Fuel Pressure (FP) Sensor. Disconnect Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 16 (signal line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 16 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the signal line. If there is NO continuity or visual short, replace the EMS Module.
4) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and EMS Module harness connector B pin 16. If there is NO continuity, repair the open in the harness signal line.
5) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity, visual short or loose, corroded and damaged terminals, replace the EMS Module.
6) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity or visual short circuit, replace the EMS Module.
7) Visually inspect both sides of the Fuel Pressure Sensor connector for a repairable open. If any of the pins feel loose or an open is found, replace the Fuel Pressure (FP) Sensor.
8) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 18 (ground line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 18 for a short circuit. If continuity exists or if there is a visual short circuit, repair the short to the return line. If there is NO continuity or visual short circuit, replace the EMS Module.
9) Visually inspect both sides of EMS Module connector B pin 11 for a repairable open in the signal line. If a repairable open is found, repair or replace EMS Module harness connector B.
10) Remove the Fuel Pressure (FP) Sensor. Connect the Fuel Pressure (FP) Sensor to a regulated air supply with an accurate pressure gauge. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 1 and pin 1 on the
sensor harness connector. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 4 and a good ground. Turn the ignition key ON. Measure the voltage between Fuel Pressure (FP) Sensor pin 2 and a good ground at
various pressures between 0 psi and 101.5 psi.
11) Visually inspect both sides of EMS Module connector B pin 18 for a repairable open in the ground line. If a repairable open is found, repair or replace EMS Module harness connector B. If the pin is making good contact, replace the EMS Module.

Fault Condition: The Electronic Malfunction Lamp (EML) will illuminate when the Fuel Pressure (FP) Sensor signal line voltage is less than 0.3 volts or greater than 4.75 volts. If the signal line voltage returns to between 0.3 volts and 4.75 volts the fault will become inactive.

Note: FMI 7 will set if the fuel pressure drops below:
14.5 psi (100 kPa) at 800 rpm
29 psi (200 kPa) at 1000 rpm
36.2 psi (250 kPa) at 1200 rpm
43.5 psi (300 kPa) at 1400 rpm
Nominal Fuel Pressure (FP) Sensor Parameters: 0.3–4.75 Volts.

Possible repairs:

Turn the ignition key OFF first.

1) Disconnect Engine Management System (EMS) Module connectors B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and a good ground. If continuity exists, locate and repair the short circuit to ground.
2) Disconnect Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 1 (reference voltage line) and EMS Module harness connector B pin 17.
If there is NO continuity, repair the open in the harness reference voltage line.
3) Disconnect the Fuel Pressure (FP) Sensor. Disconnect Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 16 (signal line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 16 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the signal line. If there is NO continuity or visual short, replace the EMS Module.
4) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connector B. Check for continuity between Fuel Pressure (FP) Sensor harness connector pin 2 (signal line) and EMS Module harness connector B pin 16. If there is NO continuity, repair the open in the harness signal line.
5) Disconnect the Fuel Pressure (FP) Sensor and the Engine Management System (EMS) Module connectors A and B. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity, visual short or loose, corroded and damaged terminals, replace the EMS Module.
6) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 17 (reference voltage line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 17 for a short circuit. If continuity exists or if there is a visual short, repair the short circuit to the reference voltage line.
If there is NO continuity or visual short circuit, replace the EMS Module.
7) Visually inspect both sides of the Fuel Pressure Sensor connector for a repairable open. If any of the pins feel loose or an open is found, replace the Fuel Pressure (FP) Sensor.
8) Disconnect Engine Management System (EMS) Module connectors A and B. Disconnect the Fuel Pressure (FP) Sensor. Check for continuity between EMS Module harness connector B pin 18 (ground line) and all other pins in EMS Module harness connectors A and B. Visually check EMS Module connector B pin 18 for a short circuit. If continuity exists or if there is a visual short circuit, repair the short to the return line. If there is NO continuity or visual short circuit, replace the EMS Module.
9) Visually inspect both sides of EMS Module connector B pin 11 for a repairable open in the signal line. If a repairable open is found, repair or replace EMS Module harness connector B.
10) Remove the Fuel Pressure (FP) Sensor. Connect the Fuel Pressure (FP) Sensor to a regulated air supply with an accurate pressure gauge. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 1 and pin 1 on the
sensor harness connector. Connect a jumper wire between Fuel Pressure (FP) Sensor pin 4 and a good ground. Turn the ignition key ON. Measure the voltage between Fuel Pressure (FP) Sensor pin 2 and a good ground at
various pressures between 0 psi and 101.5 psi.
11) Visually inspect both sides of EMS Module connector B pin 18 for a repairable open in the ground line. If a repairable open is found, repair or replace EMS Module harness connector B. If the pin is making good contact, replace the EMS Module.