Inspection and Verification
| WARNING | Always disconnect the battery ground cable at the battery before disconnecting the starter motor battery terminal lead. If a tool is shorted at the starter motor battery terminal, the tool can quickly heat enough to cause a skin burn. Failure to follow this instruction may result in serious personal injury. |
Note. When working on the starter system, make sure the anti-theft system is operating correctly.
- Verify the customer concern by operating the starting system to duplicate the conditions.
- Inspect to determine if any of the following mechanical or electrical concerns apply. VISUAL INSPECTION CHART Mechanical Electrical Starter motor Battery Battery junction box (BJB) fuses: 23 (60A) 14 (15A) Smart junction box (SJB) fuses: 10 (30A) 22 (7.5A) - 3.0L and 3.5L vehicles only Wiring harness Starter relay (part of SJB) Anti-theft system Loose or corroded connections
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
- If the scan tool does not communicate with the VCM: check the VCM connection to the vehicle. check the scan tool connection to the VCM. refer to MODULE COMMUNICATIONS NETWORK , No Power To The Scan Tool, to diagnose no communication with the scan tool.
- If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. refer to MODULE COMMUNICATIONS NETWORK to diagnose no response from the powertrain control module (PCM).
- Carry out the network test. If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK . If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
- Clear the continuous DTCs and carry out the self-test diagnostics for the instrument cluster, refer to INSTRUMENT CLUSTER .
- If the DTCs retrieved are related to the concern, go to Passive Anti-Theft System (PATS) Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
- If no DTCs related to the concern are retrieved, go to Symptom Chart .
| DTC | Description | Source | Action |
|---|---|---|---|
| B1213 | Anti-Theft Number of Programmed Keys is Below Minimum | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B1342 | ECU is Faulted | Instrument Cluster | CLEAR the DTCs. CARRY OUT the instrument cluster self-test. If DTC B1342 is retrieved, INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . |
| B1600 | PATS Key Transponder Signal is Not Received - Damaged Key or Non-PATS Key | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B1601 | PATS Received Incorrect Key-Code From Ignition Key Transponder (Unprogrammed PATS Key) | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B1602 | PATS Received Invalid Format of Key-Code From Ignition Key Transponder (Partial Key Read) | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B1681 | PATS Transceiver Module Signal is Not Received (Damaged, Not Connected or Damaged Wiring) | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B2103 | Defective Transceiver | Instrument Cluster | INSTALL a new PATS transceiver. REFER to ANTI-THEFT - PATS . |
| B2141 | NVM Memory Failure (No Target ID Stored in Instrument Cluster) | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B2431 | Transponder Programming Failed | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| B2477 | Module Configuration Failure | Instrument Cluster | CONFIGURE the instrument cluster. REFER to MODULE CONFIGURATION . CLEAR the DTCs. REPEAT the self-test. If DTC B2477 is retrieved, INSTALL a new instrument cluster, REFER to INSTRUMENT CLUSTER . |
| U1900 | CAN Communication BUS Fault | Instrument Cluster | DTCs B2141 and U2510 should be present along with U1900. REFER to ANTI-THEFT - PATS . If not, REFER to MULTIFUNCTION ELECTRONIC MODULES . |
| U2510 | CAN - Invalid data for Vehicle Security | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
| U2511 | CAN - Data Mis-Match (Receive data does not match expected) | Instrument Cluster | REFER to ANTI-THEFT - PATS . |
PASSIVE ANTI-THEFT SYSTEM (PATS) - DIAGNOSTIC TROUBLE CODE (DTC) CHART
Symptom Chart
| Condition | Possible Sources | Action |
|---|---|---|
| The engine does not crank | Battery Battery junction box (BJB) fuse(s): 23 (60A) 14 (15A) Smart junction box (SJB) fuse(s): 10 (30A) 22 (7.5A) - 3.0L and 3.5L vehicles Starter motor Circuitry Starter motor relay - part of SJB Anti-theft system Transmission range (TR) sensor - automatic transmission Clutch cutoff switch - manual transmission only | Go to Pinpoint Test A . |
| The engine cranks slowly | Battery Starter motor Circuitry | CARRY OUT the Starter Motor Component Test. |
| Unusual starter noise | Starter motor mounting Starter motor Incorrect starter drive engagement | Go to Pinpoint Test B . |
| The starter spins but the engine does not crank | Starter motor | INSPECT the starter motor mounting and engagement. REPAIR as necessary. |
| Damaged flywheel/flexplate ring gear teeth | INSPECT the flywheel/flexplate ring gear for damaged, missing or worn teeth. REPAIR as necessary. |
Symptom Chart
Pinpoint Test A: The Engine Does Not Crank
Refer to SYSTEM WIRING DIAGRAMS , Starting System for schematic and connector information.
Pinpoint Test B: Unusual Starter Noise
Possible Causes
- Starter motor mounting
- Starter motor mounting bolts
- Starter motor drive
- Flywheel or flexplate ring gear
- Starter motor
- B1 CHECK THE STARTER MOUNTING Inspect the starter motor mounting bolts and brackets for looseness. Is the starter motor mounted correctly? YES : Go to B2 . NO : INSTALL the starter motor correctly. REFER to Starter Motor - 2.3L , Starter Motor - 3.0L or Starter Motor - 3.5L . TEST the system for normal operation.
- B2 CHECK FOR ENGINE NOISE Turn the ignition switch to the OFF position. Connect a fused jumper wire from the B-terminal to the S-terminal of the starter motor. Engage the starter motor and verify that the noise is due to the starter operation. Is the noise due to the starter motor engagement? YES : Go to B3 . NO : REFER to ENGINE SYSTEM - GENERAL INFORMATION to continue the diagnosis.
- B3 CHECK FOR UNUSUAL WEAR Remove the starter motor. Refer to Starter Motor - 2.3L , Starter Motor - 3.0L or Starter Motor - 3.5L . Inspect the ring gear for damaged or worn teeth. Is the noise due to flexplate/flywheel ring gear tooth damage? YES : INSTALL a new flexplate/flywheel ring gear. EXAMINE the starter pinion teeth. If damaged, INSTALL a new starter motor. REFER to Starter Motor - 2.3L , Starter Motor - 3.0L or Starter Motor - 3.5L . TEST the system for normal operation. NO : INSTALL a new starter motor. REFER to Starter Motor - 2.3L , Starter Motor - 3.0L or Starter Motor - 3.5L . TEST the system for normal operation.