CAT

The Ecm detects one of the following after attempting to actuacte the injector solenoid: – An open circuit in the injector wiring. – An internal open circuit in the injector solenoid.

The Speed/Timing signal or Engine Speed/Timing Sensor #2 is lost and then returns (intermittent).

During the last 90 seconds of the idle shutdown mode after the Check Engine/Service Soon Lamp begins to flash, the brake or clutch pedal is depressed or released. NOTE: This diagnostic code represents an event and not Electronic system fault.

The Engine Control Module (ECM) detects the following condition:

•The primary fuel level signal voltage is above the acceptable range for more than ten seconds.

The fuel level sensors are OEM installed components for the vehicle. The sensors are selectable through a customer programmable parameter and the customer programmable parameter may be protected by customer passwords.

Possible Causes:

1) Loose ECM Connection/Harness
2) Fuel level sensor failure
3) WIring between fuel level sensor & ECM

The Engine Control Module (ECM) detects the following condition:

•The primary fuel level signal voltage is below the acceptable range for more than ten seconds.

The fuel level sensors are OEM installed components for the vehicle. The sensors are selectable through a customer programmable parameter and the customer programmable parameter may be protected by customer passwords.

Possible Causes:

1) Loose ECM Connection/Harness
2) Fuel level sensor failure
3) WIring between fuel level sensor & ECM

The acceleator pedal throttle position sensor supply voltage is lower than it should be.

The Engine Control Module (ECM) detects one of the following items after attempting to operate the injector:

•A low current condition (open circuit) exists in the wiring for the cylinder injector solenoid.
•A high current condition (short circuit) exists in the injector solenoid.

Probable Causes:

1) ECM Connection/Harness
2) Cylinder injector failure
3) Injector solenoid failure
4) Harness from ECM to valve cover connector
5) ECM failure
6) Injector harness under valve cover

The Engine Control Module (ECM) detects the following conditions:

•The signal voltage from the engine oil pressure sensor is greater than 4.95 VDC for more than eight seconds.
•The ECM has been powered for at least two seconds.
•The 168-01 Low ECM Battery Power is not active.
•The 232-03 5 Volt Supply voltage high is not active.
•The 232-04 5 Volt Supply voltage low is not active.
•The engine is not running or the engine coolant temperature is greater than 38 °C (100 °F).

The Engine Control Module (ECM) continuously creates a pull-up voltage on the signal wire for each sensor. The ECM uses this pull-up voltage in order to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a -3 diagnostic code. When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a -4 diagnostic code.

Note: There may be a delay of 30 seconds in order for Caterpillar Electronic Technician (ET) to display an active diagnostic code. When you check for a diagnostic code, be sure to wait at least 30 seconds.

The most likely cause of a code is a problem with an electrical connector or wiring. The least likely cause of a code is the ECM.

Probable Causes:

1) ECM Connection
2) Sensor or harness failure
3) Failed ECM

The Engine Control Module (ECM) detects the following conditions:

•The signal voltage from the engine oil pressure sensor is greater than 4.95 VDC for more than eight seconds.
•The ECM has been powered for at least two seconds.
•The 168-01 Low ECM Battery Power is not active.
•The 232-03 5 Volt Supply voltage high is not active.
•The 232-04 5 Volt Supply voltage low is not active.
•The engine is not running or the engine coolant temperature is greater than 38 °C (100 °F).

The Engine Control Module (ECM) continuously creates a pull-up voltage on the signal wire for each sensor. The ECM uses this pull-up voltage in order to detect a problem in the signal circuit. When the ECM detects voltage that is above a threshold on the signal wire, the ECM activates a -3 diagnostic code. When the ECM detects voltage that is below a threshold on the signal wire, the ECM activates a -4 diagnostic code.

Note: There may be a delay of 30 seconds in order for Caterpillar Electronic Technician (ET) to display an active diagnostic code. When you check for a diagnostic code, be sure to wait at least 30 seconds.

The most likely cause of a code is a problem with an electrical connector or wiring. The least likely cause of a code is the ECM.

Sensors included:
Fuel pressure sensor
Injection actuation pressure sensor
Barometric pressure sensor
Boost pressure sensor
Engine oil pressure sensor

Probable Causes:

1) ECM Connection
2) Sensor or harness failure
3) Failed ECM