DTC U0100, U0122 (Keyless Access Power Control Unit)
DTC U0100 : Power Control Unit Lost Communication with PCM
DTC U0122: Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .
- Refer to the DTC code shown on the display, and then inspect the connectors and terminals based on the instructions in the table below.
- The DTC may be stored due to the grounding failure or the power source failure at the transmitting control unit (the grounding inspection and the power source inspection on each control unit are required prior to this checking process).
| DTC Description | DTC |
|---|---|
| U0100 Power Control Unit Lost Communication with PCM | |
| U0122 Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit |
DTC (Keyless Access Power Control Unit)
- Problem verification
-1. Clear the DTCs with the HDS.
-2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
-3. Wait for at least 6 seconds.
-4. Check for DTCs with the HDS.
DTC Description DTC U0100 Power Control Unit Lost Communication with PCM U0122 Power Control Unit Lost Communication with ABS/VSA Modulator-Control Unit Are any DTCs indicated?
YES: with CAN gateway
Go to step 2.
YES: without CAN gateway
Go to step 8.
NO
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals.
- CAN gateway system DTC check
-1. Turn the vehicle to the ON mode.
-2. Check for CAN gateway system DTCs with the HDS.
DTC Description DTC U0029-00 CAN Gateway F-CAN ch A Bus Off U0047-00 CAN Gateway F-CAN ch B Bus Off DTC Description DTC U3000-49 CAN Gateway Internal Failure Is DTC U0029-00, U0047-00, and/or U3000-49 indicated?
YES
Go to the troubleshooting for CAN gateway system DTC(s) .
NO
Go to step 3.
- F-CAN circuit communication check (Receiving control unit)
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.
F-CAN Bus Connected Unit Check
Does the body control module detect the CAN gateway Bus channels A?
Bus A is Not Available
Go to step 4.
Bus A is Available
Go to step 5.
- Open wire check (F-CAN A lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connectors.
CAN gateway 12P connector (12P connector type) CAN gateway 16P connector (16P connector type) Body control module connector B (36P) -3. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 12P connector (12P connector type): disconnected CAN gateway 16P connector (16P connector type): disconnected Body control module connector B (36P): disconnected Test point 1 CAN gateway 12P connector (female terminals) (12P connector type) No. 3: CAN gateway 16P connector (female terminals) (16P connector type) No. 3:
Test point 2 Body control module connector B (36P) No. 22 Test point 1 CAN gateway 12P connector (female terminals) (12P connector type) No. 9: CAN gateway 16P connector (female terminals) (16P connector type) No. 11:
Test point 2 Body control module connector B (36P) No. 23 Is there 1.0 Ω or less?
YES
The F-CAN A_H and F-CAN A_L wires are OK. Replace the body control module .
NO
Repair an open in F-CAN A_H or F-CAN A_L wire.
- F-CAN circuit communication check (Transmitting control unit)
-1. Select the FUNCTION TEST in the CAN gateway with the HDS, then select the F-CAN Bus Connected Unit Check.
F-CAN Bus Connected Unit Check
According to the detected DTC on the following table, make sure that the transmitting control unit detects the CAN gateway Bus channel(s) normally.
DTC Transmitting control unit Detected CAN gateway Bus channel(s) at normal U0100 PCM A, B U0122 VSA modulator-control unit A, B Is it detected normally?
Detected normal
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the transmitting control unit and the CAN gateway.
U0100: PCM is Not Available for Bus A
Go to step 6.
U0100: PCM is Not Available for Bus B
Go to step 7.
U0122: VSA modulator-control unit is Not Available for Bus A
Go to step 6.
U0122: VSA modulator-control unit is Not Available for Bus B
Go to step 7.
- Open wire check (F-CAN A lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.
SCS short
-3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).
DTC Connector - CAN gateway 12P connector (12P connector type)CAN gateway 16P connector (16P connector type) U0100 PCM connector A (50P) U0122 VSA modulator-control unit 46P connector -4. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 12P connector (12P connector type): disconnected CAN gateway 16P connector (16P connector type): disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected CAN gateway 12P connector type
DTC Circuit name Test point 1 (Receiving control unit) Test point 2 (Transmitting control unit) Connector Terminal Connector Terminal U0100 F-CAN A_H CAN gateway 12P connector (female terminals): No. 3 PCM connector A (50P) No. 37 F-CAN A_L No. 9 No. 36 U0122 F-CAN A_H CAN gateway 12P connector (female terminals): No. 3 VSA modulator-control unit 46P connector No. 40 F-CAN A_L No. 9 No. 28 CAN gateway 16P connector type
DTC Circuit name Test point 1 (Receiving control unit) Test point 2 (Transmitting control unit) Connector Terminal Connector Terminal U0100 F-CAN A_H CAN gateway 16P connector (female terminals): No. 3 PCM connector A (50P) No. 37 F-CAN A_L No. 11 No. 36 U0122 F-CAN A_H CAN gateway 16P connector (female terminals): No. 3 VSA modulator-control unit 46P connector No. 40 F-CAN A_L No. 11 No. 28 Is there 1.0 Ω or less?
YES
The F-CAN A_H wire and the F-CAN A_L wire are OK. According to the detected DTC on the following table replace the correspond control unit.
DTC Operation for transmitting control unit U0100 PCM U0122 VSA modulator-control unit NO
Repair an open in F-CAN A_H or F-CAN A_L wire.
- Open wire check (F-CAN B lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.
SCS short
-3. According to the detected DTC on the following table, disconnect the transmitting control unit connector(s).
DTC Connector - CAN gateway 12P connector (12P connector type)CAN gateway 16P connector (16P connector type) U0100 PCM connector A (50P) U0122 VSA modulator-control unit 46P connector -4. Measure the resistance between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode CAN gateway 12P connector (12P connector type): disconnected CAN gateway 16P connector (16P connector type): disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected CAN gateway 12P connector type
DTC Circuit name Test point 1 (Receiving control unit) Test point 2 (Transmitting control unit) Connector Terminal Connector Terminal U0100 F-CAN B_H CAN gateway 12P connector (female terminals): No. 12 PCM connector A (50P) No. 39 F-CAN B_L No. 5 No. 38 U0122 F-CAN B_H CAN gateway 12P connector (female terminals): No. 12 VSA modulator-control unit 46P connector No. 46 F-CAN B_L No. 5 No. 34 CAN gateway 16P connector type
DTC Circuit name Test point 1 (Receiving control unit) Test point 2 (Transmitting control unit) Connector Terminal Connector Terminal U0100 F-CAN B_H CAN gateway 16P connector (female terminals): No. 6 PCM connector A (50P) No. 39 F-CAN B_L No. 14 No. 38 U0122 F-CAN B_H CAN gateway 16P connector (female terminals): No. 6 VSA modulator-control unit 46P connector No. 46 F-CAN B_L No. 14 No. 34 Is there 1.0 Ω or less?
YES
The F-CAN B_H wire and the F-CAN B_L wire are OK.According to the detected DTC on the following table replace the correspond control unit.
DTC Operation for transmitting control unit U0100 PCM U0122 VSA modulator-control unit NO
Repair an open in F-CAN B_H or F-CAN B_L wire.
- Open wire check (F-CAN_H line, F-CAN_L line)
-1. Turn the vehicle to the OFF (LOCK) mode.
-2. Disconnect the following connector.
Body control module connector B (36P) -3. U0100: Jump the SCS line with the HDS, and wait more than 1 minute.
SCS short
-4. Disconnect the transmitting control unit connector(s).
Refer to the DTC shown on the display, then disconnect the connector(s) based on the instructions (see table).
DTC Connector U0100 PCM connector A (51P) U0122 VSA modulator-control unit 46P connector -5. Measure the resistance between the receiving control unit and the transmitting control unit on the F-CAN_H circuit and the F-CAN_L circuit.
Test condition Receiving control unit connector(s): disconnected Transmitting control unit connector(s) for indicated DTCs: disconnected DTC Circuit name Receiving control unit Transmitting control unit Connector Terminal Connector Terminal U0100 F-CAN_H Body control module connector B (36P) No. 22 PCM connector A (51P) No. 2 F-CAN_L No. 23 No. 1 U0122 F-CAN_H Body control module connector B (36P) No. 22 VSA modulator-control unit 46P connector No. 40 F-CAN_L No. 23 No. 28 Is there 1.0 Ω or less?
YES
The F-CAN_H wire and the F-CAN_L wire are OK. Refer to the DTC shown on the display, replace the control unit based on the instructions (see table).
DTC Operation for transmitting control unit U0100 PCM U0122 VSA modulator-control unit NO
Repair an open in the F-CAN_H wire and/or the F-CAN_L wire.