DTC Troubleshooting: P15B7 (30)
DTC P15B7:
 Starter Control System Low Input
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch OFF.
  1. Turn the ignition switch ON (II), and wait for 5 seconds.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P15B7 indicated?
YES -
Go to Step 6 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the TCM and the ECM.■
  1. Turn the ignition switch OFF.
  1. Jump the SCS line with the HDS.
  1. Disconnect ECM connector A (44P).
  1. Measure voltage between ECM connector terminal A41 and body ground.
Is there voltage?
YES -
Substitute a known-good TCM, then go to Step 13 . If DTC P15B7 is not indicated, replace the original TCM, then go to Step 13 .
NO -
Go to Step 10 .
  1. Turn the ignition switch OFF.
  1. Disconnect TCM connector A (37P).