Acura RL (1996-2004 year). Manual — part 281

Electrical Troubleshooting

Troubleshooting Flowchart — Torque Converter Clutch (Lock-up Control)

Solenoid Valve A

• OBD II Scan Tool indicates Code

P0743.

• Self-diagnosis indicator

light blinks once.

Possible Cause

• Disconnected torque converter

clutch solenoid valve A connec-
tor

• Short or open in torque con-

verter clutch solenoid valve A
wire

• Faulty torque converter clutch

solenoid valve A

• Open in VB SOL line

Check for a Short to Power:

1. Turn the ignition switch OFF.

2. Disconnect the A (26P) and E

(26P) connectors from the PCM.

3. Turn the ignition switch ON (II).
4. Measure the voltage between

the E13 and A26 terminals.

Is there voltage?

NO

Repair short to power in the wire
between the E13 terminal and the

torque converter clutch solenoid
valve A.

Measure Torque Converter Clutch
Solenoid Valve A Resistance:

1. Turn the ignition switch OFF.

2. Measure the resistance

between the E13 and A26 ter-
minals.

Is the resistance 12-25 ?

NO

Check for loose PCM connectors.
If necessary, substitute a known-
good solenoid valves A and B or
PCM and recheck.

To page

14-5

Main Menu

Table of Contents

From page

14-4

Check Torque Converter Clutch
Solenoid Valve A for a Short
Circuit:

1. Disconnect the 2P connector

from the torque converter
clutch solenoid valves A and B.

2. Check for continuity between

the E13 and A26 terminals.

Is there continuity?

NO

Repair short to ground in the wire

between the E13 terminal and the
torque converter clutch solenoid
valve A.

Measure Torque Converter Clutch
Solenoid Valve A Resistance at

the Solenoid Connector:

Measure the resistance between

the No. 2 terminal of the torque
converter clutch solenoid connec-
tor and body ground.

the resistance

NO

Check for open in the wire
between the E13 terminal and the
torque converter clutch solenoid
valve A.

Is there voltage?

YES

Check for open in the wire
between the E1 terminal and the

under-hood fuse/relay box.

Replace the torque converter
clutch solenoid valves A and B.

Check the VB SOL Voltage:

1. Turn the ignition switch ON (II).

2. Measure the voltage between

the E1 and A26 terminals.

Main Menu

Table of Contents

Electrical Troubleshooting

Troubleshooting Flowchart — Torque Converter Clutch (Lock-up Control)

Solenoid Valve B

• OBD II Scan Tool indicates Code

P2756.

• Self-diagnosis indicator light

blinks twice.

Check for a Short to Power:

1. Turn the ignition switch OFF.

2. Disconnect the A (26P) and

E (26P) connectors from the
PCM.

3. Turn the ignition switch ON (II).
4. Measure the voltage between

the E26 and A26 terminals.

Is there voltage?

NO

Measure Torque Converter Clutch
Solenoid Valve B Resistance:

1. Turn the ignition switch OFF.

2. Measure the resistance

between the E26 and A26 ter-
minals.

Is the resistance 12 - 25

NO

To page

14-7

Possible Cause

• Disconnected torque converter

clutch solenoid valve B connec-
tor

• Short or open in torque con-

verter clutch solenoid valve B
wire

• Faulty torque converter clutch

solenoid valve B

• Open VB SOL line

Repair short to power in the wire
between the E26 terminal and the

torque converter clutch solenoid
valve B.

Check for loose PCM connectors.
If necessary, substitute a known-
good solenoid valves A and B or
PCM and recheck.

Main Menu

Table of Contents

From page

14-6

Check Torque Converter Clutch
Solenoid Valve B for a Short
Circuit:

1. Disconnect the 2P connector

from the torque converter
clutch solenoid valves A and B.

2. Check for continuity between

the E26 and A26 terminals.

Is there continuity?

NO

Repair short to ground in the wire
between the E26 terminal and the
torque converter clutch solenoid
valve B.

Measure Torque Converter Clutch
Solenoid Valve B Resistance at the
Solenoid Connector:
Measure the resistance

the No. 1 terminal of the torque
converter clutch solenoid connec-
tor and body ground.

the resistance

NO

Check for open in the wire
between the E26 terminal and the
torque converter clutch solenoid
valve B.

Is there voltage?

Check for open in the wire
between the E1 terminal and the
under-hood fuse/relay box.

Check the VB SOL Voltage:

1. Turn the ignition switch ON (II).

2. Measure the voltage between

the E1 and

terminals.

Replace the torque converter
clutch solenoid valves A and B.

Main Menu

Table of Contents