Low Circuit Current

Control System DTCs

DTC Troubleshooting: C1852-18

DTC C1852-18 : Solenoid Valve Circuit Low Current

NOTE: Before you troubleshoot, review the how to troubleshoot the real time AWD system.

1. Problem verification (with idling):

-1. Turn the ignition switch to ON (II).

-2. Clear the DTC with the HDS.

-3. Start the engine.

-4. Check for DTCs with the HDS.

Is DTC C1852-18 indicated?
-YES- The failure is duplicated. Go to step 3.
-NO- Go to step 2.

2. Problem verification (motor running):

-1. Clear the DTC with the HDS.

-2. With the engine running, do the Air Bleeding in the Adjustment Menu with the HDS Procedures.

-3. Check for DTCs with the HDS.

Is DTC C1852-18 indicated?
-YES- The failure is duplicated. Go to step 3.
-NO- Intermittent failure, the system is OK at this time.

3. Determine possible failure area (GND line, others):

-1. Check for continuity between test points 1 and 2.

Is there continuity?
-YES- Go to step 6.
-NO- Go to step 4.

4. Open wire check (GND line):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.

-3. Check for continuity between the following test points and body ground.

Is there continuity?
-YES- The GND wires are OK. Go to step 5.
-NO- Repair an open in the GND wires between the real time AWD control unit and ground (G603).

5. Open wire check (DG line):

-1. Check for continuity between test points 1 and 2.

Is there continuity?
-YES- Update the real time AWD control unit if it does not have the latest software Real Time AWD Control Unit Update, or substitute a known-good real time AWD control unit Service and Repair, and recheck. If the symptom/indication goes away with the updated real time AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good real time AWD control unit, replace the original real time AWD control unit Service and Repair.
-NO- Check for poor connections or loose terminals between the real time AWD control unit and the rear differential body ground (T7). If the connections are OK, repair an open in the DG wire between the rear differential body and the real time AWD control unit.

6. Determine possible failure area (DTYH1 line, others):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.

-3. Turn the ignition switch to ON (II).

-4. Wait for 10 seconds.

-5. Measure the voltage between test points 1 and 2.

Is there about 0.1 V or less?
-YES- Go to step 8.
-NO- Go to step 7.

7. Shorted wire check (DTYH1 line to power):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.

-3. Turn the ignition switch to ON (II).

-4. Measure the voltage between test points 1 and 2.

Is there about 0.1 V or less?
-YES- Update the real time AWD control unit if it does not have the latest software Real Time AWD Control Unit Update, or substitute a known-good real time AWD control unit Service and Repair, and recheck. If the symptom/indication goes away with the updated real time AWD control unit, troubleshooting is complete. If the symptom/indication goes away with a known-good real time AWD control unit, replace the original real time AWD control unit Service and Repair.
-NO- Repair a short to power in the DTYH1 wire between the rear differential solenoid valve and the real time AWD control unit.

8. Rear differential solenoid valve check:

-1. Measure the resistance between test points 1 and 2.

Is there about 100 Ohms or less?
-YES- The rear differential solenoid valve is OK. Go to step 9.
-NO- Replace the rear differential solenoid valve Rear Differential Disassembly And Reassembly (KA, KC Models AWD).

9. Shorted wire check (DUTY1 line):

-1. Turn the ignition switch to LOCK (0).

-2. Disconnect the following connector.

-3. Check for continuity between test points 1 and 2.

Is there continuity?
-YES- Repair a short in the DUTY1 wire between the rear differential solenoid valve and the real time AWD control unit.
-NO- The DUTY1 wire is not shorted. Go to step 10.

10. Open wire check (DUTY1/DTYH1 line):

-1. Check for continuity between test points 1 and 2.