Circuit Description
The PCM has the ability to disable starter operation if conditions inappropriate for starter operation exist. The PCM disables the starter if the engine is running, if a correct VTD password is not received from the PASS-Key® III module or if the vehicle operator attempts to engage the starter for an extended period of time.
The PCM controlled starter system consists of the following components:
| • | Starter enable relay. |
| • | The Transaxle Range / Park Neutral Position switch. |
| • | The ignition switch. |
| • | The starter solenoid. |
| • | The PCM. |
Diagnostic Aids
The PCM Controlled Starter Diagnosis table is intended to identify electrical malfunctions that can occur with the system. For additional system diagnosis, refer to Starter and Charging in Electrical Diagnosis. For starter motor diagnosis and on-vehicle service, refer to Cranking System .
Check for the following conditions:
| • | Poor connection at the PCM , the starter enable relay, the Transaxle Range / PNP switch, the ignition switch or the starter solenoid. |
| Inspect harness connectors for the following conditions: |
| - | Backed out terminals. |
| - | Improper mating. |
| - | Broken locks. |
| - | Improperly formed or damaged terminals. |
| - | Poor terminal to wire connection. |
| • | Damaged harness. |
| Inspect the wiring harness for damage. |
| • | Either of the following conditions can cause the PCM to disable starter operation: |
| - | The engine has been running for longer than 10 seconds. |
| - | The starter has been continuously engaged for longer than 15 seconds. |
| - | A correct VTD password has not been received from the PASS-Key® III module. |
Test Description
Number(s) below refer to step number(s) in the diagnostic table.
-
Checks for a short to ground in the relay control circuit (CKT 1737 or CKT 625).
-
Determines if the circuit is shorted before or after the Transaxle Range switch or the PCM is defective.
-
Ensures battery voltage is available at cavity 30 of the relay connector.
-
Ensures battery voltage is available to the relay coil with the ignition switch in the RUN position.
-
Ensures battery voltage is available to the relay coil with the ignition switch in the CRANK position.
-
A blown fuse indicates a short to ground in the B+ feed to cavity 30, CKT 6, or the starter solenoid.
-
A blown fuse indicates a short to ground in the CKT 439, or a shorted starter enable relay coil.
-
Checks for an open or short to voltage in CKT 1737. A short to voltage in the starter enable relay control circuit will cause a thermal shutdown of the relay driver.
-
This vehicle is equipped with a PCM which utilizes an Electrically Erasable Read Only Memory (EEPROM) When the PCM is being replaced, the new PCM must be programmed.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to OBD System Check | |||||||
Does the vehicle crank/start with the ignition switch in the RUN position? | -- | |||||||||
3 |
Important: If any of the following DTCs are set, diagnose the DTC(s) first:
Attempt to start the vehicle Does the Engine crank? | -- | Refer to Diagnostic Aids | |||||||
Does the vehicle crank/start with the ignition switch in the RUN position? | -- | |||||||||
5 |
Is the test light ON? | -- | ||||||||
Is the test light ON? | -- | |||||||||
Is the test light ON? | -- | |||||||||
Is the test light ON? | -- | |||||||||
9 |
Is the test light ON? | -- | ||||||||
10 |
Was a problem found? | -- | Go toStep 37 | |||||||
Check the 40 amp maxifuse which feeds cavity 30 in the starter enable relay connector. Is the fuse blown? | -- | |||||||||
12 |
Is the test light ON? | -- | ||||||||
13 |
Was a problem found? | -- | ||||||||
14 |
Was a problem found? | -- | ||||||||
Check the 10 amp fuse which feeds the starter enable relay control circuit. Is the fuse blown? | -- | |||||||||
16 |
Is the test light ON? | -- | ||||||||
17 | Check the 30 amp (Ignition 1) maxifuse which feeds the 10 amp starter enable fuse. Is the fuse blown? | -- | ||||||||
18 |
Was a problem found? | -- | ||||||||
Is the test light ON? | -- | |||||||||
20 |
Is the test light ON? | -- | ||||||||
21 |
Is the test light ON? | -- | ||||||||
22 |
Was a problem found? | -- | ||||||||
23 |
Was a problem found? | -- | ||||||||
24 | Locate and repair short to ground in CKT 1737. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
25 | Locate and repair the short to ground in CKT 625. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
26 | Locate and repair the short to ground in the B+ feed to cavity 30 in the starter enable relay connector. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
27 | Locate and repair the open in the B+ feed to cavity 30 in the starter enable relay connector. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
28 | Locate and repair the following circuit condition(s):
Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
29 | Locate and repair the short to ground in the feed circuit to the 10 amp fuse. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
30 | Locate and repair the short to B+ in CKT 1737. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
31 | Locate and repair the open in CKT 1737. Refer to Repair Procedures in Electrical Diagnosis . Is action complete? | -- | -- | |||||||
32 | Replace the Ignition switch. Refer to Steering Wheel and Column On-Vehicle Service . Is action complete? | -- | -- | |||||||
33 | Replace the starter enable relay. Is action complete? | -- | -- | |||||||
34 | Service the starter. Refer to Starting Systems . Is action complete? | -- | -- | |||||||
35 | Replace the Transaxle Range Switch. Refer to 4T60-E / 4T65-E Automatic Transaxle On-Vehicle Serivce . Is action complete? | -- | -- | |||||||
Replace the PCM. Important: The replacement PCM must be programmed. Refer to PCM replacement/programming. Is action complete? | -- | -- | ||||||||
37 | Attempt to start the vehicle. Does the engine crank? | -- | System OK |
