Page 858 of 5267
P2502-CHARGING SYSTEM ERROR
For a complete wiring diagramRefer to Section 8W.
Page 861 of 5267
P2503-CHARGING SYSTEM OUTPUT LOW
For a complete wiring diagramRefer to Section 8W.
Page 864 of 5267
P2504-CHARGING SYSTEM OUTPUT HIGH
For a complete wiring diagramRefer to Section 8W.
Page 868 of 5267
P2509-POWERDOWN DATA LOST ERROR
For a complete wiring diagramRefer to Section 8W.
Page 872 of 5267
P2607-LOW VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY
For a complete wiring diagramRefer to Section 8W.
Page 875 of 5267
P2608-HIGH VOLTAGE AT THE #2 INTAKE AIR HEATER RELAY
For a complete wiring diagramRefer to Section 8W.
Page 878 of 5267
P2609-NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS
For a complete wiring diagramRefer to Section 8W.
Page 882 of 5267
*CHECKING THE ECM POWER AND GROUNDS
For a complete wiring diagramRefer to Section 8W.
Possible Causes
ECM GROUND CIRCUIT(S) OPEN
FUSED B+ CIRCUIT OPEN
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
Diagnostic Test
1.ECM GROUND CIRCUIT(S) OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness connector.
Did the test light illuminate for each cavity?
Ye s>>
Go To 2
No>>
Repair the ECM Ground circuit(s) for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
2.FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the Fused Ignition Switch Output circuit in ECM harness con-
nector.
Is the test light on?
Ye s>>
Go To 3
No>>
Repair the Fused Ignition Switch Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
3.FUSED B+ CIRCUIT OPEN
Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to ground, check each Fused B+ circuitin the ECM harness connector.
Does the test light illuminatebrightly for each circuit?
Ye s>>
Te s t C o m p l e t e .
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
No>>
Repair the Fused B+ Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC-
TRONIC CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
