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Rear Differential: Other Honda Pilot II

Differentials & Drive Axles 33 illustrations ~3489 words

VTM-4 Indicator

The VTM-4 indicator comes on under certain conditions even if the 4WD system is working normally. Here are some examples

  1. When you use high-powered wireless equipment such as a CB or Ham radio in the vehicle.
  2. When you keep spinning the rear wheels while the vehicle is stuck in sand, mud, snow, etc.
  3. When the battery voltage suddenly drops below 10 volt.

When the VTM-4 indicator comes on, it stays on until you turn the ignition switch to LOCK (0).

How to Clear the VTM-4 Control Unit Memory

There are two methods used to clear DTCs from the VTM-4 control unit memory. The recommended method is to use the HDS with the appropriate software plugged into the data link connector (DLC).

The other method is to connect the service check signal (SCS) connector with the HDS, and manually clear the memory.

Scheme 55

Scheme 55: HDS Method
Scheme 55: HDS Method
  1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) (A) behind the driver's dashboard lower cover.
  2. Turn the ignition switch to ON (II).
  3. Make sure the HDS communicates with the vehicle and the VTM-4 control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  4. Follow the prompts on the HDS screen to clear the DTC(s). NOTE: See the HDS user's manual for specific instructions.

Scheme 56

Scheme 56: Service Check Signal Circuit (SCS) Method
Scheme 56: Service Check Signal Circuit (SCS) Method

Scheme 57

Scheme 57
Scheme 57
  1. Park the vehicle on level ground. Shift to P, then turn the ignition switch to LOCK (0).
  2. Release the parking brake pedal.
  3. With the ignition switch in LOCK (0), connect the HDS to the DLC (A).
  4. Turn the ignition switch to ON (II).
  5. Make sure the HDS communicates with the vehicle and the VTM-4 control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  6. Short the SCS circuit to body ground using the HDS.
  7. The VTM-4 indicator comes on and stays on for 4 seconds. Press and hold the VTM-4 LOCK button while the VTM-4 indicator is on.
  8. When the VTM-4 indicator goes off, release the VTM-4 LOCK button.
  9. The VTM-4 indicator comes on and stays on for 4 seconds. Push the VTM-4 LOCK button while the VTM-4 indicator is on.
  10. When the VTM-4 indicator goes off, release the VTM-4 LOCK button. The VTM-4 indicator will blink twice quickly to confirm that the DTCs have been cleared from the VTM-4 control unit memory. NOTE: If the VTM-4 indicator does not blink twice quickly, the memory has not been cleared. Turn the ignition switch to LOCK (0), then repeat steps 6 through 10 .
  11. Turn the ignition switch to LOCK (0), then disconnect the HDS from the DLC.

Initialization Of the VTM-4 Control Unit

Whenever the VTM-4 control unit is replaced, it must be initialized to make the 4WD system function. There are two methods used to initialize the VTM-4 control unit. The recommended method is to use the Honda Diagnostic System (HDS) with the appropriate software plugged into the data link connector (DLC). The other method is to initialize the VTM-4 control unit manually.

Scheme 58

Scheme 58: Initialization With the HDS
Scheme 58: Initialization With the HDS
  1. With the ignition switch in LOCK (0), connect the HDS to the DLC (A).
  2. Turn the ignition switch to ON (II).
  3. Make sure the HDS communicates with the vehicle and the VTM-4 control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  4. Follow the prompts on the HDS screen. NOTE: See the HDS user's manual for specific instructions.

Scheme 59

Scheme 59: Manual Initialization
Scheme 59: Manual Initialization
  1. Start the engine (the VTM-4 indicator comes on, and the VTM-4 LOCK switch indicator is off).
  2. Apply the brakes, and shift to either R, 1, or 2, then push the VTM-4 LOCK button (the VTM-4 indicator stays on, and the VTM-4 LOCK switch indicator is on). The 4WD system is now in lock mode.
  3. Shift to P and turn the ignition switch to LOCK (0).
  4. Turn the ignition switch to ON (II) (the VTM-4 indicator and the VTM-4 LOCK indicator both come on for 4 seconds, then go off). The VTM-4 control unit is initialized.

Outline

This vehicle is equipped with a rear differential system called the variable torque management® 4WD (VTM-4®) system. The VTM-4 control unit controls the currents flowing through electromagnetic coils to engage and disengage the right and left clutches in the rear differential assembly.

VTM-4 features include

  1. Vehicle acceleration torque control (VATC)
  2. Limited slip differential (LSD)
  3. Lock control

LSD (Limited Slip Differential) Control

The torque to be delivered to the rear wheels is calculated based on the differences in speed and acceleration between the front and rear wheels.

Scheme 60

Scheme 60: LSD (Limited Slip Differential) Control
Scheme 60: LSD (Limited Slip Differential) Control

LOCK Control

Rear differential clutch lock control is done by pushing the VTM-4 LOCK switch manually when the shift lever is in R, 1 or 2.

Scheme 61

Scheme 61: LOCK Control
Scheme 61: LOCK Control

Scheme 62

Scheme 62: VTM-4 Control Unit Electrical Connections
Scheme 62: VTM-4 Control Unit Electrical Connections

VTM-4 Control Unit Inputs and Outputs

The VTM-4 control unit terminal voltages and the measuring conditions for the VTM-4 control system are shown.

Do the VTM-4 inputs and outputs test with the VTM-4 connectors connected.

Terminal numberWire colorSignalDescriptionMeasuring Conditions/Terminal Voltage
A1GRNIG1Power supply for VTM-4 control unitWith ignition switch ON (II): battery voltage
A4ORN/GRNFSRDrives VTM-4 relayWith ignition switch ON (II): battery voltage With engine running: about 0 V
A6BLK/YELPBRKDetects parking brake signalWith parking brake switch on: less than 2.0 V With parking brake switch off: battery voltage
A8BRN/WHTLCK SWDetects VTM-4 lock switch signalWith ignition switch ON (II): about 0 V With VTM-4 lock switch pressed: battery voltage
A10BLKLG1Unit groundWith ignition switch ON (II): about 0 V
A11WHTCANHF-CAN communication signalWith ignition switch ON (II): about 2.5 V to 3.5 V
A12YELNEPDetects engine speed pulseWith ignition switch ON (II): about 8.0 V With engine running at 1,000 RPM: about 5.0 V to 8.0 V
A13BLKTOLDetects rear differential fluid temperature sensor signalWith ignition switch ON (II): about 1.0 V to 3.7 V (Depending on ATF temperature)
A14PNKWL1Drives VTM-4 indicatorWith VTM-4 indicator on: less than 4.0 V With VTM-4 indicator off: battery voltage
A15WHTTOHPower supply for differential fluid temperature sensorWith ignition switch ON (II): about 4.7 V to 5.0 V
A16YEL/BLKLCKLDrives VTM-4 LOCK indicatorWith VTM-4 LOCK indicator on: less than 4.0 V With VTM-4 LOCK indicator off: battery voltage
A18LT BLUK-LINECommunication line VTM-4 control unit to DLCWith ignition switch ON (II): about 8.0 V to 12.0 V
A20BRNSCSDetects service check signalWith SCS circuit shorted: less than 2.0 V With SCS circuit opened: about 5.0 V
A22REDCANLF-CAN communication signalWith ignition switch ON (II): about 2.5 V to 1.5 V

CONNECTOR TERMINALS DESCRIPTION TABLE

Scheme 63

Scheme 63
Scheme 63

The VTM-4 control unit terminal voltages and the measuring conditions for the VTM-4 control system are shown.

Do the VTM-4 inputs and outputs test with the VTM-4 connectors connected.

Terminal numberWire colorSignalDescriptionMeasuring Conditions/Terminal Voltage
B1WHTLCHDrives left clutch electromagnetic coil (positive)With ignition switch ON (II): about 0 V With VTM-4 lock mode: battery voltage
B2REDLCLDrives left clutch electromagnetic coil (negative)With ignition switch ON (II): about 0 V
B3PNKRCHDrives right clutch electromagnetic coil (positive)With ignition switch ON (II): about 0 V With VTM-4 lock mode: battery voltage
B4BLURCLDrives right clutch electromagnetic coil (negative)With ignition switch ON (II): about 0 V
B5BLKPGActuator groundWith ignition switch ON (II): about 0 V
B7RED/BLUPWRPower supply for VTM-4 actuatorWith engine running: battery voltage
B11PNKWL2Drives VTM-4 indicatorWith VTM-4 indicator on: less than 4.0 V With VTM-4 indicator off: battery voltage
B12BLKLG2Unit groundWith ignition switch ON (II): about 0 V

CONNECTOR TERMINALS DESCRIPTION TABLE

Scheme 64

Scheme 64
Scheme 64

Scheme 65

Scheme 65: Circuit Diagram
Scheme 65: Circuit Diagram

Scheme 66

Scheme 66
Scheme 66

21-2, 22-2, 23-2, 24-2: CAN Communication Error With the VSA (Left-Front Wheel Speed Sensor); CAN Communication Error With the VSA (Right-Front Wheel Speed Sensor); CAN Communication Error With the VSA (Left-Rear Wheel Speed Sensor); CAN Communication Error With the VSA (Right-Rear Wheel Speed Sensor)

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 67

Scheme 67: 21-2, 22-2, 23-2, 24-2: CAN Communication Error With the VSA (Left-Front Wheel Speed Sensor); CAN Co
Scheme 67: 21-2, 22-2, 23-2, 24-2: CAN Communication Error With the VSA (Left-Front Wheel Speed Sensor); CAN Co

Scheme 68

Scheme 68
Scheme 68
  1. Turn the ignition switch to ON (II).
  2. Make sure the HDS communicates with the vehicle and the VTM-4 control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  3. Clear the DTC with the HDS.
  4. Start the engine.
  5. Check for DTCs with the HDS. Is DTC 21-2, 22-2, 23-2, and/or 24-2 indicated? YES - Go to step 6 . NO - Intermittent failure, the system is OK at this time.
  6. Check for DTCs in the VSA system with the HDS. Are any wheel speed sensor DTCs indicated? YES - Go to the indicated DTC's troubleshooting. • NO - Go to step 7 .
  7. Turn the ignition switch to LOCK (0).
  8. Disconnect the VSA modulator-control unit 36P connector.
  9. Disconnect VTM-4 control unit connector A (22P).Connect the VSA modulator-control unit 36P connector terminals No. 1 and No. 14 to body ground with jumper wires.
  10. Check for continuity between VSA modulator-control unit 36P connector terminal No. 1, No 14. and VTM-4 control unit connector terminals A11 and A22 respectively. Is there continuity YES - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). • NO - Repair open in the wires between VTM-4 control unit connector terminals A11 and A22 and the VSA modulator-control unit 36P connector terminals No. 1 and No. 14.

The VTM-4 Indicator Does Not Go Off, But No DTCs Are Stored In Any System: VTM-4, VSA or PGM-FI

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 69

Scheme 69: The VTM-4 Indicator Does Not Go Off, But No DTCs Are Stored In Any System: VTM-4, VSA or PGM-FI
Scheme 69: The VTM-4 Indicator Does Not Go Off, But No DTCs Are Stored In Any System: VTM-4, VSA or PGM-FI

Scheme 70

Scheme 70
Scheme 70
  1. Check the No. 1 (7.5 A) fuse in the driver's under-dash fuse/relay box. Is the fuse OK? YES - Go to step 2 . NO - Replace the fuse, and recheck.
  2. Do the VTM-4 control unit Initialization (see «INITIALIZATION OF THE VTM-4 CONTROL UNIT»(ref-333569-S08756474922009072100000) ).
  3. Turn the ignition switch to ON (II).
  4. Check the VTM-4 indicator. Does the VTM-4 indicator come on and stay on? YES - Go to step 5 . NO - The system is OK at this time.
  5. Measure the voltage between VTM-4 control unit connector terminals A1 and A10, and between VTM-4 control unit connector terminals A1 and B12. Is there battery voltage? YES - Go to step 6 . NO - Repair open in the wire between VTM-4 control unit connector terminals A1 and driver's under-dash fuse/relay box, or VTM-4 control unit connector terminals A10 or B12 and body ground.
  6. Turn the ignition switch to LOCK (0).
  7. Disconnect VTM-4 control unit connector A (22P) and the gauge control module 32P connector.
  8. Check for continuity between VTM-4 control unit connector terminals A14 and B11 to body ground. Is there continuity? YES - Repair short to ground in the wire between VTM-4 control unit connector terminals A14 or B11 and gauge control module. • NO - Go to step 9 .
  9. Reconnect the gauge control module 32P connector.
  10. Turn the ignition switch to ON (II).
  11. Check the VTM-4 indicator. Does the VTM-4 indicator come on? YES - Go to the gauge control module self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(ref-333620-S02042375952009072100000) ). • NO - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ).

The VTM-4 Indicator Does Not Come On

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 71

Scheme 71: The VTM-4 Indicator Does Not Come On
Scheme 71: The VTM-4 Indicator Does Not Come On

Scheme 72

Scheme 72
Scheme 72
  1. Turn the ignition switch to ON (II).
  2. Check the VTM-4 indicator. Does the VTM-4 indicator come on? YES - Intermittent failure, the system is OK at this time. • NO - Go to step 3 .
  3. Turn the ignition switch to LOCK (0).
  4. Disconnect VTM-4 control unit connector A (22P) and B (12P).
  5. Connect VTM-4 connector terminal A14 and B11 individually to body ground with jumper wires.
  6. Turn the ignition switch to ON (II).
  7. Check the VTM-4 indicator. Does the VTM-4 indicator come on? YES - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). • NO - Go to step 8 .
  8. Turn the ignition switch to LOCK (0).
  9. Remove the jumper wires.
  10. Connect the gauge control module 32P connector terminal No. 14 to body ground with a jumper wire.
  11. Turn the ignition switch to ON (II).
  12. Check the VTM-4 indicator. Does the VTM-4 indicator come on? YES - Repair open in the wire between the gauge control module and the VTM-4 control unit. • NO - Go to the gauge control module self-diagnostic function (see «SELF-DIAGNOSTIC FUNCTION»(ref-333620-S02042375952009072100000) ).

The VTM-4 LOCK Indicator Does Not Come On When the VTM-4 LOCK Button Is Pressed

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION . The VTM-4 LOCK indicator will only come on when the engine is running and the shift lever is in R, 1 or 2 before the button is pressed.

Scheme 73

Scheme 73: The VTM-4 LOCK Indicator Does Not Come On When the VTM-4 LOCK Button Is Pressed
Scheme 73: The VTM-4 LOCK Indicator Does Not Come On When the VTM-4 LOCK Button Is Pressed

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75

Scheme 76

Scheme 76
Scheme 76

Scheme 77

Scheme 77
Scheme 77
  1. Check the No. 1 (7.5 A) and No. 10 (7.5 A) fuses in the driver's under-dash fuse/relay box. Are the fuses OK? YES - Go to step 2 . NO - Replace the fuses, and recheck.
  2. Turn the ignition switch to ON (II).
  3. Check the VTM-4 LOCK indicator. Does the VTM-4 LOCK indicator come on, and does it go off 4 seconds later? YES - Go to step 4 . NO - Go to step 14 .
  4. Start the engine, and move the shift lever to R, 1 and 2.
  5. Check the VTM-4 LOCK indicator. Does the VTM-4 LOCK indicator come on when the VTM-4 LOCK button is pressed? YES - Intermittent failure, the system is OK at this time. • NO - Go to step 6 .
  6. Make sure the HDS communicates with the vehicle and the VTM-4 control unit. If it doesn't, troubleshoot the DLC circuit (see «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  7. Check for DTCs in the A/T system with the HDS. Are there any A/T DTCs indicated? YES - Go to the indicated DTC's troubleshooting. • NO - Go to step 8 .
  8. Turn the ignition switch to LOCK (0).
  9. Disconnect VTM-4 control unit connector A (22P).
  10. Turn the ignition switch to ON (II).
  11. Measure the voltage between VTM-4 control unit connector terminals A8 and body ground. Is there battery voltage when the VTM-4 LOCK switch Is pressed? YES - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). • NO - Go to step 12 .
  12. Turn the ignition switch to LOCK (0).
  13. Test the VTM-4 LOCK switch (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). Is the VTM-4 LOCK switch OK? YES - Repair open in the wire between the VTM-4 LOCK switch and the VTM-4 control unit • NO - Replace the VTM-4 LOCK switch (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ).
  14. Disconnect VTM-4 control unit connector A (22P).
  15. Connect VTM-4 connector terminal A16 to body ground with a jumper wire.
  16. Check the VTM-4 LOCK indicator. Does the VTM-4 LOCK indicator come on? YES - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). • NO - Go to step 17 .
  17. Turn the ignition switch to LOCK (0).
  18. Remove the jumper wire.
  19. Disconnect the VTM-4 LOCK switch 5P connector.
  20. Connect the VTM-4 LOCK switch 5P connector terminal No. 4 to body ground with a jumper wire.
  21. Check for continuity between VTM-4 control unit connector terminal A16 and body ground. Is there continuity? YES - Go to step 22 . NO - Repair open in the wire between VTM-4 control unit connector terminal A16 and VTM-4 LOCK switch 5P connector.
  22. Remove the jumper wire.
  23. Turn the ignition switch to ON (II).
  24. Measure the voltage between VTM-4 LOCK switch 5P connector terminal No. 2 and body ground. Is there battery voltage? YES - Replace the VTM-4 LOCK indicator bulb. • NO - Repair open in the wire between the VTM-4 LOCK switch 5P connector terminal No. 2 and the driver's under-dash fuse/relay box.

The VTM-4 LOCK Indicator Comes On When The Ignition Switch Is Turned ON (II) and Does Not Go Off

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 78

Scheme 78: The VTM-4 LOCK Indicator Comes On When The Ignition Switch Is Turned ON (II) and Does Not Go Off
Scheme 78: The VTM-4 LOCK Indicator Comes On When The Ignition Switch Is Turned ON (II) and Does Not Go Off
  1. Disconnect VTM-4 control unit connector A (22P).
  2. Turn the ignition switch to ON (II).
  3. Check the VTM-4 LOCK indicator. Does the VTM-4 LOCK indicator come on? YES - Go to step 4 . NO - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ).
  4. Turn the ignition switch to LOCK (0).
  5. Disconnect the VTM-4 LOCK switch 5P connector.
  6. Check for continuity between VTM-4 control unit connector terminals A16 and body ground. Is there continuity? YES - Repair short to ground in the wire between VTM-4 control unit connector terminals A16 and the VTM-4 LOCK switch 5P connector. • NO - Replace the VTM-4 LOCK switch (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ).

The VTM-4 LOCK Indicator Does Not Come On For About 4 Seconds When the Ignition Switch Is Turned ON (II)

Note. Before you troubleshoot, review GENERAL TROUBLESHOOTING INFORMATION .

Scheme 79

Scheme 79: The VTM-4 LOCK Indicator Does Not Come On For About 4 Seconds When the Ignition Switch Is Turned ON
Scheme 79: The VTM-4 LOCK Indicator Does Not Come On For About 4 Seconds When the Ignition Switch Is Turned ON

Scheme 80

Scheme 80
Scheme 80

Scheme 81

Scheme 81
Scheme 81

Scheme 82

Scheme 82
Scheme 82
  1. Disconnect VTM-4 control unit connector A (22P).
  2. Connect VTM-4 connector terminal A16 to body ground with a jumper wire.
  3. Turn the ignition switch to ON (II).
  4. Check the VTM-4 LOCK indicator. Does the VTM-4 LOCK indicator come on? YES - Check for poor connections or loose terminals at the VTM-4 control unit connectors. If the connections are OK, substitute a known-good VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ) and recheck. If the symptom/indication goes away with the known-good VTM-4 control unit, replace the original VTM-4 control unit (see «VTM-4 CONTROL UNIT REPLACEMENT»(ref-333569-S19952800512009072100000) ). • NO - Go to step 5 .
  5. Turn the ignition switch to LOCK (0).
  6. Remove the jumper wire.
  7. Disconnect the VTM-4 LOCK switch 5P connector.
  8. Connect the VTM-4 LOCK switch 5P connector terminal No. 4 to body ground with a jumper wire.
  9. Check for continuity between VTM-4 control unit connector terminal A16 and body ground. Is there continuity? YES - Go to step 10. NO - Repair open in the wire between VTM-4 control unit connector terminals A16 and VTM-4 LOCK switch 5P connector.
  10. Remove the jumper wire.
  11. Turn the ignition switch to ON (II).
  12. Measure the voltage between the VTM-4 LOCK switch 5P connector terminal No. 2 and body ground. Is there battery voltage? YES - Replace the VTM-4 LOCK indicator bulb. • NO - Repair open in the wire between the VTM-4 LOCK switch 5P connector terminal No. 2 and the driver's under-dash fuse/relay box.

Scheme 83

Scheme 83: Inspection
Scheme 83: Inspection
  1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0).
  2. Use solvent and a brush to wash any oil and dirt off the differential fluid inspection oil filler plugs.
  3. Remove the filler plug (A) and the sealing washer (B), then check the condition of the fluid, and make sure the fluid is at the proper level (C).
  4. Make sure the fluid is at the proper level (C). If the level is below the proper level, check for fluid leaks at the differential. If a problem is found, fix it before filling the differential with fluid.
  5. The fluid level must reach up to the bottom of the filler plug hole. If necessary, add the recommended fluid until it runs out of the filler hole, then reinstall the filler plug with a new sealing washer.

Scheme 84

Scheme 84: Replacement
Scheme 84: Replacement
  1. Park the vehicle on level ground, and turn the ignition switch to LOCK (0).
  2. Remove the filler plug (A) and the sealing washer (B). Fluid Capacity 2.64 L (2.79 US qt) at fluid change 2.85 L (3.01 US qt) at overhaul Recommended fluid: Honda VTM-4 Differential Fluid
  3. Remove the drain plug (C) and the sealing washer (D), and drain the fluid.
  4. Reinstall the drain plug with a new sealing washer.
  5. Refill the recommended fluid until it reaches the bottom of the filler plug hole.
  6. Reinstall the filler plug with a new sealing washer.

Note. Before doing the Differential Function Test, the following conditions must be present.

  1. No DTCs detected.
  2. Engine is not running.
  3. The VTM-4 control unit must be initialized.
  1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) (A) behind the driver's dashboard lower cover.
  2. Turn the ignition switch to ON (II).
  3. Make sure the HDS communicates with the VTM-4 control unit. If it doesn't, go to «DLC CIRCUIT TROUBLESHOOTING»(ref-333558-S02093989162009072100000) ).
  4. Confirm that the temperature of the differential fluid is between 68°F (20°C) and 140°F (60°C) with the HDS.
  5. Turn the ignition switch to LOCK (0) with the shift lever in P.
  6. Release the parking brake pedal.
  7. Raise the vehicle on the lift so all four wheels are off the ground.
  8. Remove the rear wheels.
  9. Turn the ignition switch to ON (II).
  10. Select MISCELLANEOUS TEST, then select the LEFT CLUTCH ELECTROMAGNETIC COIL TEST with the HDS, and follow the screen prompts. If the results are NORMAL, the left clutch is OK, Go to step 9 . If the results are ABNORMAL, replace the rear differential.
  11. Select MISCELLANEOUS TEST, then select the RIGHT CLUTCH ELECTROMAGNETIC COIL TEST with the HDS, and follow the screen prompts. If the results are NORMAL, the right clutch is OK. If the results are ABNORMAL, replace the rear differential.

Scheme 85

Scheme 85: Differential Fluid Temperature Sensor Replacement
Scheme 85: Differential Fluid Temperature Sensor Replacement
  1. Drain the differential fluid. Reinstall the drain plug with a new sealing washer (see «DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(ref-333569-S01826009402009072100000) ).
  2. Remove the wire harness cover (A), then disconnect the differential fluid temperature sensor 2P connector (B).
  3. Remove the rear differential fluid temperature sensor (C).
  4. Install the rear differential fluid temperature sensor with a new O-ring (D) in the reverse order of removal
  5. Refill the differential with the recommended differential fluid (see «DIFFERENTIAL FLUID INSPECTION AND REPLACEMENT»(ref-333569-S01826009402009072100000) ).

Scheme 86

Scheme 86: VTM-4 LOCK Switch Test/Replacement
Scheme 86: VTM-4 LOCK Switch Test/Replacement

Scheme 87

Scheme 87
Scheme 87
  1. Remove the Driver's center panel (see «DASHBOARD CENTER PANEL REMOVAL/INSTALLATION»(ref-333587-S16005184032009072100000) ).
  2. Disconnect the VTM-4 LOCK switch 5P connector from the VTM-4 LOCK switch (A), then remove the VTM-4 LOCK switch from the driver's center panel (B).
  3. Check for continuity between the terminals in each button position according to the table below.
  4. If the continuity check is not as specified, replace the VTM-4 LOCK switch bulb or the VTM-4 LOCK switch.

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