DTC C1851-19, C1851-1E
DTC C1851-19 : Control Module Internal Control Module Malfunction
DTC C1851-1E : Motor Circuit High Current
NOTE: Before you troubleshoot, review the General Troubleshooting Information .
| DTC Description | DTC | Freeze Frame |
|---|---|---|
| C1851-19 Control Module Internal Control Module Malfunction | ||
| C1851-1E Motor Circuit High Current |
DTC (Real Time AWD)
- Problem verification (with engine idling)
-1. Turn the vehicle to the ON mode.
-2. Clear the DTC with the HDS.
-3. Turn the vehicle to the OFF (LOCK) mode.
-4. Enter the maintenance mode and start the engine .
-5. Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C1851-19 Control Module Internal Control Module Malfunction C1851-1E Motor Circuit High Current Is DTC C1851-19 or C1851-1E indicated?
YES
The failure is duplicated. Go to step 3.
NO
Go to step 2.
- Problem verification (with rear differential pump motor running)
-1. Clear the DTC with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode.
-3. Enter the maintenance mode and start the engine .
-4. Select the ADJUSTMENT in the REAL TIME AWD with the HDS.
-5. With the engine running, do the AIR BLEEDING in the ADJUSTMENT with the HDS .
Air Bleeding
Check for DTCs with the HDS.
DTC Description DTC Freeze Frame C1851-19 Control Module Internal Control Module Malfunction DTC Description DTC Freeze Frame C1851-1E Motor Circuit High Current Is DTC C1851-19 or C1851-1E indicated?
YES
The failure is duplicated. Go to step 3.
NO
Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.
- Determine possible failure area (short to power in MH, ML lines, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Rear differential pump motor 2P connector -3. Turn the vehicle to the ON mode.
-4. Wait for 10 seconds.
-5. Measure the voltage between the following test points 1 and 2 individually.
Test condition Vehicle ON mode Rear differential pump motor 2P connector: disconnected Connector Test point 1 Test point 2 Rear differential pump motor 2P connector (female terminals) No. 1: Body ground No. 2: Is there about 0.1 V or less?
YES
Go to step 5.
NO
Go to step 4.
- Shorted wire check (MH line to power, ML line to power)
-1. Disconnect the following connector.
AWD control unit 24P connector -2. Turn the vehicle to the ON mode.
-3. Measure the voltage between the following test points 1 and 2 individually.
Test condition Vehicle ON mode Rear differential pump motor 2P connector: disconnected AWD control unit 24P connector: disconnected Connector Test point 1 Test point 2 Rear differential pump motor 2P connector (female terminals) No. 1: Body ground No. 2: Is there about 0.1 V or less?
YES
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .
NO
Repair short to power in the MH and/or ML wires between the rear differential pump motor and the AWD control unit.
- Determine possible failure area (short to ground in MH line, others)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Connect the following connector.
Rear differential pump motor 2P connector -3. Disconnect the following connector.
AWD control unit 24P connector -4. Measure the resistance between the following test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode AWD control unit 24P connector: disconnected Test point 1 AWD control unit 24P connector No. 1 Test point 2 Body ground Is there 1.0 MΩ or more?
YES
Go to step 7.
NO
Go to step 6.
- Rear differential pump motor check
-1. Disconnect the following connector.
Rear differential pump motor 2P connector -2. On the rear differential pump motor side, measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear differential pump motor 2P connector: disconnected Test point 1 Rear differential pump motor 2P connector (male terminals) No. 1: Test point 2 Rear differential pump motor 2P connector (male terminals) No. 2: Is there about 0.6 Ω or more?
YES
The rear differential pump motor is OK. Go to step 7.
NO
- Determine possible failure area (short in MH, ML line, others)
-1. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode AWD control unit 24P connector: disconnected Test point 1 AWD control unit 24P connector No. 1 Test point 2 AWD control unit 24P connector No. 3 Is there 1.0 MΩ or more?
YES
Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .
NO
Go to step 8.
- Shorted wire check (MH line to ML line)
-1. Disconnect the following connector.
Rear differential pump motor 2P connector -2. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear differential pump motor 2P connector: disconnected AWD control unit 24P connector: disconnected Test point 1 Rear differential pump motor 2P connector (female terminals) No. 1: Test point 2 Rear differential pump motor 2P connector (female terminals) No. 2: Is there 1.0 MΩ or more?
YES
The MH wire to the ML wire are OK. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting or substitute a known-good AWD control unit , and recheck. If the symptom/indication goes away with a known-good AWD control unit, replace the original AWD control unit .
NO
Repair a short in the MH wire to the ML wire between the rear differential pump motor and the AWD control unit.