CONTROL GP-TORQUE 9N1071 - Caterpillar

Illustration 1 g01228349
Location of the J1/P1 and the customer connector (typical left side engine view)
(1) J1/P1 ECM connectors
(2) Customer connector
Illustration 2 g01227331
Typical schematic for the emergency stop switch
Illustration 3 g01227424
Terminal locations at the P1 ECM connector
(P1-5) Digital return
(P1-21) Start/Run/Stop input 1
(P1-22) Start/Run/Stop input 2
(P1-23) Emergency stop signal "C"
(P1-28) Emergency stop signal "D"
(P1-52) +Battery
(P1-53) +Battery
(P1-55) +Battery (ECM)
(P1-56) Air shutoff (NO)
(P1-63) −Battery
(P1-65) −Battery
(P1-70) Keyswitch
Illustration 4 g01227669
Terminal locations at the customer connector
(Terminal 01) +Battery
(Terminal 02) +Battery
(Terminal 04) Air shutoff
(Terminal 09) Digital return
(Terminal 16) Emergency stop signal "D"
(Terminal 17) Emergency stop signal "C"
(Terminal 23) Start/Run/Stop input 1
(Terminal 24) Start/Run/Stop input 2
(Terminal 27) Keyswitch
(Terminal 34) −Battery
(Terminal 35) −Battery Test Step 1. Check for Active Diagnostic Codes
Remove electrical power from the ECM.
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the ECM.
Check for an active 337-2 diagnostic code.
Remove electrical power from the ECM. Expected Result:The 337-2 diagnostic code is not active.Results:
OK - The 337-2 diagnostic code is not active. Proceed to Test Step 2.
Not OK - The 337-2 diagnostic code is active.Repair: If the diagnostic code 337-2 is active, the wires between the ECM and the emergency stop switch are in opposite states. Check the wires for an open circuit.
Disconnect the J1/P1 ECM connector.
Measure the resistance between P1-23 at ECM connector P1 and terminal 2