LINES GP-STEERING 1197224 - Caterpillar

Illustration 4 g01970074
Locations of the circuit breakers (typical right side engine view) (7) Circuit breaker for the ECM (15 amp) (8) Circuit breaker for the auxiliary circuit (20 amp) (9) Circuit breaker for the starting system (40 amp) (10) Circuit breaker for the alternator (40 amp)
Illustration 5 g01970754
Terminal locations at the P1 ECM connector that are for the electrical power supply (P1-1) -Battery (P1-2) -Battery (P1-3) -Battery (P1-7) +Battery (P1-8) +Battery (P1-9) -Battery (P1-10) -Battery (P1-15) +Battery (P1-16) +Battery (P1-35) Digital return (P1-40) Keyswitch (P1-50) Stop mode (P1-51) Run mode
Illustration 6 g01970796
Terminal locations at the interconnect harness connector that are for the electrical power supply (Terminal h) Stop mode (Terminal r) Digital return (Terminal w) Keyswitch (Terminal x) -Battery (Terminal z) +Battery (Terminal O) Run Mode
Illustration 7 g01926235
Connections at the terminal strip that is in the display panel (Terminal 9) Engine stop signal (Terminal 10) Run mode (Terminal 11) Return (Terminal 15) Keyswitch power (Terminal 16) −Battery (Terminal 17) +Battery
Illustration 8 g01970799
Terminal locations at the connector for the breaker panel that are for the electrical power supply (Terminal A) +Battery (Terminal B) +Battery (Terminal C) +Battery (Terminal D) +Battery (Terminal F) -Battery (Terminal G) -Battery (Terminal H) -Battery (Terminal J) -Battery
Table 2
1. Check for Logged Codes or Active Codes
A. Establish communication between Cat® Electronic Technician (Cat® ET) and the engine ECM.
Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Determine if the code is active or logged.    
Codes    
Results: A 158-2 code is logged or active.
Proceed to Test Step 2.
Results: A 168-2 code is logged or active.
Proceed to Test Step 3.
Results: A -4 code is logged or active.    
1. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the ECM connectors. Also, thoroughly inspect the other connectors for the electrical power circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the proper procedure for inspecting the connectors and the wiring.
   
Electrical connectors    
Results: The connectors and wiring appear to be OK.
Proceed to Test Step 2.
Results: There is a problem in the connectors and/or wiring.
Repair The connectors or wiring and/or replace the connectors or wiring. Ensure that all of the seals are properly in place and ensure that the connectors are coupled.
Verify that the repair eliminated the problem.
   
2. Check the Voltage to the ECM
A. Disconnect the ECM connector J1/P1.
B. Restore the electrical power to the ECM.
C. Measure the voltage at the ECM. Measure the voltage between P1-53 and P1-65. Measure the voltage between P1-52 and P1-63.
   
ECM voltage    
Result: The voltage is 24 3 VDC.
The ECM is receiving the correct voltage. The problem may be intermittent. If the problem is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".
Result: The voltage is less than 24 3 VDC.
The wiring or components between the battery and the ECM may be preventing the voltage from reaching the ECM.
Proceed to Test Step 3
   
3. Check the Charging Circuit
A. Turn the main disconnect switch to the OFF position.
A. Check the charging circuit.
   
Charging