825207A 1 Mariner TPI/CDM TEST HARNESS

Illustration 1 g01329817
Schematic for ECM battery circuit
Test Step 1. Inspect the Electrical Connectors and the Wiring
Illustration 2 g01329803
Location of the J1/P1 ECM connectors (typical left side engine view)
Thoroughly inspect the J1/P1 ECM connector and the firewall bulkhead connectors. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Illustration 3 g01387466
Terminal locations at the P1 ECM connector for the keyswitch and battery supply circuit
(P1-48) Unswitched +Battery
(P1-52) Unswitched +Battery
(P1-53) Unswitched +Battery
(P1-63) −Battery
(P1-65) −Battery
(P1-67) −Battery
(P1-70) Keyswitch
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit for the keyswitch and the battery.
Check the allen head screw for each of the ECM connectors for the proper torque. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and wiring for abrasion and for pinch points from the battery to the ECM, and from the keyswitch to the ECM. Expected Result:All connectors, pins and sockets are completely coupled and/or inserted and the harness and wiring are free of corrosion, of abrasion and of pinch points.Results:
OK - The harness and connectors appear to be OK. Proceed to Test Step 2.
Not OK - There is a problem with the connectors and/or wiring.Repair: 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 completely coupled. Verify that the repair eliminates the problem.STOPTest Step 2. Use Cat ET to Check for Communications with the ECM
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Establish communications with the engine ECM. Note: Wait at least 30 seconds in order for Cat ET to establish communications.Expected Result:Cat ET is communicating with the engine ECM.Results:
OK - Cat ET is communicating with the engine ECM. Proceed to Test Step 3.
Not OK - Cat ET will not establish communications with the engine ECM. Proceed to Test Step 4.Test Step 3. Check for Active Diagnostic Codes or Logged Diagnostic Codes
Connect Cat ET to the service tool connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on Cat ET. Check and record any active diagnostic codes or logged diagnostic codes. Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:One of the following diagnostic codes is active or logged:
43-2 Key Switch Fault
168-0 Excessive ECM Battery Power
168-1 Low ECM Battery Power
168-2 ECM Battery Power IntermittentNote: A 43-2 code can be generated by rapidly cycling the keyswitch. If the 43-2 Key Switch Fault is logged but not active, this may be the cause.Results:
OK - A 43-2, 168-0, 168-1, or 168-2 diagnostic code is active or logged. Proceed to Test Step 4.
Not OK - No diagnostic code is active.Repair: The problem is no longer present. There may be an intermittent electrical problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.STOPTest Step 4. Check for Battery Voltage at the ECM Connector
Disconnect the J1/P1 ECM connectors.
Turn the keyswitch to the ON position.
Measure the voltage between P1-48 (unswitched +Battery) and P1-63 (-Battery).
Measure the voltage between P1-52 (unswitched +Battery) and P1-65 (-Battery).
Measure the voltage between P1-53 (unswitched +Battery) and P1-67 (-Battery).
Measure the voltage between P1-70 (keyswitch) and P1-67 (-Battery).
Turn the keyswitch to the OFF position. Expected Result:For 12 Volt Systems, the measured voltage is a constant 11.0 to 13.5 VDC with no suspected intermittent problems at this time.For 24 Volt Systems, the measured voltage is a constant 22.0 to 27.0 VDC with no suspected intermittent problems at this time.Results:
OK - The ECM is receiving the correct voltage. Repair: If an intermittent condition is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - Keyswitch - No voltage is present on P1-70.Repair: Check for continuity in the wiring for the keyswitch from P1-70 through the keyswitch circuit to the batteries. Check the circuit protection for