Test C: HCU Pump Motor Circuit Open
NOTE:
DTC C1096 is generated when battery voltage is not detected when it is expected. Possible contributing conditions include an open in motor winding or circuit, defective drive circuit in ABCM, and connector terminals damaged or backed out.
- Turn ignition off. Connect NGS tester or scan tool. Turn ignition on. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES . Perform DRIVE CYCLE TEST . Retrieve and document continuous DTCs. If DTC C1096 is retrieved, go to next step. If different DTC is retrieved, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table. If SYSTEM PASS is obtained, go to step 5 .
- Turn ignition off. Disconnect HCU connector (2 terminal connector). Using jumper wires, apply battery voltage and ground to HCU terminals. See Fig 1 . If pump motor operates, go to next step. If pump motor does not operate, replace HCU. Go to step 5 .
- Turn ignition off. Connect Breakout Box connector. Measure resistance between Breakout Box pin No. 2 and HCU connector at Red/Yellow wire terminal. Next, measure resistance between Breakout Box pin No. 20 and HCU Red/Yellow wire terminal. If resistances are less than 5 ohms, go to next step. If resistances are greater than 5 ohms, repair Red/Yellow wire. Go to step 5 .
- Measure resistance between Breakout Box pin No. 30 and HCU connector at Yellow wire terminal. If resistance is less than 5 ohms, replace ABCM. Go to next step. If resistance is greater than 5 ohms, repair Yellow wire. Go to next step.
- Reconnect all disconnected components. Restore vehicle, clear continuous DTCs. Perform DRIVE CYCLE TEST . Retrieve and document continuous DTCs. If SYSTEM PASS is obtained, repair is complete. If SYSTEM PASS is not obtained and DTC C1096 exists, go to step 1) . If different DTCs exist, see DIAGNOSTIC TROUBLE CODE DEFINITIONS table.