ADHESIVE 5P3321 - Caterpillar

Use this procedure to troubleshoot a problem with a solenoid valve or relay. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.
Table 1
J1939 Code and Description Comments
632-5
Engine Fuel Shutoff Valve #1 : Current Below Normal This code indicates that there is a problem with the engine gas shutoff valve relay and/or electrical circuit.
632-6
Engine Fuel Shutoff Valve #1 : Current Above Normal This code indicates that there is a problem with the engine gas shutoff valve relay and/or electrical circuit.
677–5
Engine Starter Motor Relay : Current Below Normal This code indicates that there is a problem with the starter motor relay and/or electrical circuit .
677–6
Engine Starter Motor Relay : Current Above Normal This code indicates that there is a problem with the starter motor relay and/or electrical circuit .
1387-5
Auxiliary Pressure #1 : Current Below Normal This code indicates there is a problem with the auxiliary pressure sensor and/or sensor wiring circuit
1387-6
Auxiliary Pressure #1 : Current Above Normal This code indicates there is a problem with the auxiliary pressure sensor and/or sensor wiring circuit
2634-5
Power Relay : Current Below Normal This code indicates that there is a problem with the relay and/or electrical circuit from the ECM.
Relay powers the following:
- Fuel actuator
2634-6
Power Relay : Current Above Normal This code indicates that there is a problem with the relay and/or electrical circuit from the ECM.
Relay powers the following:
- Fuel actuator
2807–5
Engine Fuel Shutoff Valve #2 : Current Below Normal This code indicates that there is a problem with the auxiliary gas shutoff valve and/or the electrical circuit on the ECM.
2807–6
Engine Fuel Shutoff Valve #2 : Current Above Normal This code indicates that there is a problem with the auxiliary gas shutoff valve and/or the electrical circuit on the ECM. Electrical Checkouts on the Cat® Electronic Technician (ET)
Table 2
Component Electrical Checkout
Engine Starter Solenoid Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active. Refer to the application-specific schematic for the "Engine Starter Motor Solenoid" wiring circuit.
Engine Starter Motor Relay Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active. Refer to the application-specific schematic for the "Engine Starter Motor Relay" wiring circuit.
Fuel Actuator Power Supply Relay Turn main disconnect switch to the "ON" position.
Gas Shutoff Valve #1 Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active.
Refer to the application-specific schematic for the gas shut-off valve or GSOV circuit.
Gas Shutoff Valve #2 Attempt to start the engine. Once the ECM attempts to energize the solenoid, the code will become active.
Refer to the application-specific schematic for the gas shut-off valve or GSOV circuit.
Auxiliary Pressure Sensor Turn key switch to the "ON" position.
Table 3
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A -5 code is active or