Circuit Description
Use a properly functioning scan tool with the diagnostic tables in this section. DO NOT use the Clear Info function unless instructed by a diagnostic procedure.
Important: This vehicle, equipped with a Powertrain Control Module (PCM), utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). Program the new PCM when the diagnostics call for replacement of the PCM. Refer to Powertrain Control Module/Throttle Actuator Control Module Replacement .
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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An engine which starts and then stalls is a good indication that there is a problem with the Vehicle Theft Deterrent system, or the Class 2 circuit, or the Column Lock system exists. Refer to Body and Accessories/Wiring Systems.
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An engine that just cranks and does not attempt to start indicates that the PCM is not powered-up. Refer to PCM Schematic (full page) for PCM harness terminal numbers.
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A ground must be available at both terminals for the scan tool to operate.
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A no start condition occurs when fuse 16 or 23 is open. The MIL is inoperative and the Driver Information Center will display the Reduced Engine Power message. Refer to Full Page PCM Schematic for complete circuit details.
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If the the test lamp does not illuminate for a circuit, inspect the fuse for being open. If the fuse is open, inspect the circuit for a short to ground.
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Inspect for an open fuse 29 in the Instrument Panel Electrical Center. If the fuse is open, repair the grounded circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Important: This table assumes that the scan tool you are using is functional.
Does the scan tool power-up? | -- | ||
Important: If the engine is not cranked within 5 seconds after the ignition key is turned on, mis-diagnosis could occur. Does the engine start and then stall after approximately 5 seconds? | -- | Go to Body and Accessories/Wiring Systems | ||
Did the engine just crank over and not start? | -- | |||
5 |
Is the test lamp illuminated? | -- | ||
Probe the DLC terminals 4 and 5 using a test lamp J 35616-200 connected to B+. Is the test lamp illuminate on both the circuits? | -- | |||
7 | Inspect the scan tool connections to the DLC. Also inspect the terminals for proper terminal tension at the DLC. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
8 | Repair the open ground circuit to the DLC terminals 4 and 5. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
Does the test lamp illuminate for each circuit? | -- | |||
10 | Measure the resistance between the battery ground and the PCM ground circuits (C1-72, 76 and C2-21, 60) in the PCM harness connectors using a DMM J 39200 . Does the DMM display the specified value (or lower) on each circuit? | 5 ohms | ||
11 | Inspect the PCM for proper connections. Refer to Body and Accessories/Wiring Systems. Did you find and correct the condition? | -- | ||
12 |
Important: Program the replacement PCM. Refer to Powertrain Control Module/Throttle Actuator Control Module Replacement . Replace the PCM. Is the action complete? | -- | -- | |
13 | Repair the Class 2 circuit for being open between the splice pack and the DLC. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
Repair the circuit that did not illuminate the test lamp. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | ||
15 | Repair the faulty PCM ground circuit(s). Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- | |
Repair the faulty B+ supply circuit. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | -- |
