RECOVERY GP-COOLANT 3042018 - Caterpillar

Verify that the repair eliminated the problem.
Result: A 632-5 code is active.
Repair: The code can be caused by an actual open circuit or by a short circuit to the +Battery.
Proceed to Test Step 3.
Result: A 632-6 code is active.
Repair: There appears to be a short circuit in the circuit for the GSOV.
Proceed to Test Step 7.
Result: A 632-7 code is active.
Repair: The ECM disabled the ignition in order to stop the engine. The GSOV appears to be stuck open. Repair the valve assembly or replace the valve assembly.
Verify that the repair eliminated the problem.
   
3. Check for a Short Circuit to +Battery in the Harness
A. Ensure that no combustible gas is present in the surrounding atmosphere.
B. Verify that the engine control is set to STOP.
C. Disconnect the connector from the GSOV.
D. Use a multimeter to check the voltage at the harness connector for the GSOV.
   
No Voltage
   
Result: Voltage is not present at the harness connector for the GSOV.
Proceed to Test Step 4.
Result: Voltage is present at the harness connector for the GSOV.
Proceed to Test Step 6.
   
4. Create a Short Circuit at the Harness Connector for the Gas Shutoff Valve
A. Remove the electrical power from the engine.
B. Fabricate a jumper wire that is long enough to create a test circuit at the harness connector for the GSOV. Crimp connector pins to each end of the jumper wire.
C. Disconnect the harness connector from the GSOV.
D. Install the jumper wire into the two terminals of the harness connector for the GSOV.
E. Restore the electrical power to the engine. Set the engine control switch to STOP.
   
632-6 Code
   
Result: A 632-6 code is active.
Perform the following procedure:
1. Disconnect the harness connector for the solenoid.
2. Use a multimeter to measure the coil resistance for the solenoid. Measure the resistance between terminals 1 and 2 at the solenoid connector.
3. Restore the wiring to the original configuration.
4. The correct resistance of the coil is approximately 16.5 Ohms. If the condition of the coil is suspect, replace the solenoid.
Verify that the repair eliminated the problem.
Result: A 632-5 code is active.
Proceed to Test Step 5.
   
5. Create a Short Circuit at the ECM Connector and Check for Diagnostic Codes
A. Verify that the electrical power is removed from the engine.
B. Disconnect the J1/P1 and the J2/P2 ECM connectors.
C. Fabricate a jumper wire that is long enough to create a test circuit across the ECM connector. Crimp connector sockets to each end of the jumper wire.
D. Remove the wires from terminal locations P1-61 and P2-5 at the ECM connector. Install one end of the jumper wire into each of these terminal locations.
E. Connect the J1/P1 and the J2/P2 ECM connectors.
F. Restore the electrical power to the engine. Set the ECS to the STOP position.
Note: The 632-5 Engine Fuel Shutoff Valve #1 : Current Below Normal can only be detected when the output for the start command is off. The output is normally off when the ECS is in the STOP position and the engine speed is zero