Page 105 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 105V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF306
CONTINUED 3
Step 7:
Measure the continuity and insulation of the following connections:
●Connection code 5BF.
●Connection code 5LW.
Between lock-up/brake 1 solenoid valve and the internal connector on the transmission.
Are the continuity and insulation correct?
If YES, contact the Techline.
If NO, replace the internal wiring harness on the automatic transmission.
Step 8:
Check the continuity and insulation of the following connection:
●Connection code 5LW between components 119 and 754.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If + after ignition feed is not present after checking the feeds and earths on the transmission computer, contact
the Techline.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 106 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 106V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
STEP 1 (checking the brake 2 solenoid valve): DF307
PRESENT
OR
STORED
ENGINE BRAKE
1.DEF: Hydraulic, mechanical or electrical fault on solenoid valves, deal with the
other faults first
NOTESOrder of priority in the event of more than one fault:
If there is a combination of the following faults:
–DF300 "Brake 2 solenoid valve circuit"
–DF306 "Lock-up/brake 1 solenoid valve circuit",
–DF307 "Engine brake",
deal first with faults DF300 "Brake 2 solenoid valve circuit" and DF306 "Lock-up/
brake 1 solenoid valve circuit".
Conditions for applying fault finding procedures to stored faults:
The fault appears after:
Lever in "Drive" position.
The solenoid valve control status corresponds to a fault
OR the pressure switch status corresponds to a fault.
System effects:
Significant engine braking.
lock-up inhibited (i.e. open) to avoid stalling.
Customer complaint:
Major engine braking when the fault appears, then a complete absence of engine
braking.
Fault warning light comes on.
Look for any damage to the wiring harness, and check the condition and connection of the automatic
transmission computer and the hydraulic distributor.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for + after ignition feed on connection 5LW of component 754.
Is the + after ignition feed still present?
If YES, move on to step 1.
If NO, move on to step 8.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
AJ0_V04_DF307/AJ0_V05_DF307
Page 107 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 107V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF307
CONTINUED 1
Step 1:
Disconnect the connector from component 119, measure the resistance of brake 2 solenoid valve
(on the connector of component 119) between the following connections:
●Connection code 5R.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, contact the Techline.
If NO, move on to step 2.
Step 2:
Disconnect connector R22 and check continuity and insulation of the following connections:
●Connection code 5R.
●Connection code 5LW.
Between components 119 and R22.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Are the continuity and insulation correct?
If YES, move on to step 3.
If NO, replace the external wiring harness on the automatic transmission.
Stage 3:
Measure the resistance of brake 2 solenoid valve (on connector R22) between the following connections:
●Connection code 5R.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, and if the fault is still present, contact the Techline.
If NO, move on to step 4.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 108 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 108V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF307
CONTINUED 2
Stage 4:
Drain the automatic transmission (see, MR 370, Mechanical, 23A Automatic transmission, Oil change) and
remove the transmission housing (see, MR 370, Mechanical, 23A Automatic transmission, Hydraulic
distributor).
Disconnect the connector from component 754, measure the resistance of brake 2 solenoid valve
(on the connector of the internal wiring harness of the transmission) between the following connections:
●Connection code 5R.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, move on to step 5.
If NO, move on to step 6.
Stage 5:
Measure the continuity and insulation of the following connections:
●Connection code 5R.
●Connection code 5LW.
Between components R22 and the internal connector in the transmission.
Are the continuity and insulation correct?
If YES, contact the Techline.
If NO, replace the intermediate wiring harness between connector R22 and the internal connector in the
transmission.
Stage 6:
Disconnect the connector from brake 2 solenoid valve, measure the resistance of brake 2 solenoid valve
between the following connections:
●Connection code 5R.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, move on to step 7.
If NO, replace the hydraulic distributor.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 109 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 109V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF307
CONTINUED 3
Step 7:
Measure the continuity and insulation of the following connections:
●Connection code 5R.
●Connection code 5LW.
Between brake 2 solenoid valve and the internal connector on the transmission.
Are the continuity and insulation correct?
If YES, contact the Techline.
If NO, replace the internal wiring harness on the automatic transmission.
Step 8:
Check the continuity and insulation of the following connection:
●Connection code 5LW between components 119 and 754.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If + after ignition feed is not present after checking the feeds and earths on the transmission computer, contact
the Techline.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 110 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 110V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
STEP 2 (checking the lock-up/brake 1 solenoid valve): DF307
CONTINUED 4
Look for any damage to the wiring harness, and check the condition and connection of the automatic
transmission computer and the hydraulic distributor.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for + after ignition feed on connection 5LW of component 754.
Is the + after ignition feed still present?
If YES, move on to step 1.
If NO, move on to step 8.
Step 1:
Disconnect the connector from component 119, measure the resistance of the lock-up/brake 1 solenoid valve
(on the connector of component 119) between the following connections:
●Connection code 5BF.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, contact the Techline.
If NO, move on to step 2.
Step 2:
Disconnect connector R22 and check continuity and insulation of the following connections:
●Connection code 5BF.
●Connection code 5LW.
Between components 119 and R22.
If the connection or connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Are the continuity and insulation correct?
If YES, move on to step 3.
If NO, replace the external wiring harness on the automatic transmission.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 111 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 111V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF307
CONTINUED 5
Stage 3:
Measure the resistance of lock-up/brake 1 solenoid valve (on connector R22) between the following
connections:
●Connection code 5BF.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, and if the fault is still there, contact the Techline.
If NO, move on to step 4.
Stage 4:
Drain the automatic transmission (see, MR 370, Mechanical, 23A Automatic transmission, Oil change) and
remove the transmission housing (see, MR 370, Mechanical, 23A Automatic transmission, Hydraulic
distributor).
Disconnect the connector from component 754, measure the resistance of lock-up/brake 1 solenoid valve
(on the connector of the internal wiring harness of the transmission) between the following connections:
●Connection code 5BF.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, move on to step 5.
If NO, move on to step 6.
Stage 5:
Measure the continuity and insulation of the following connections:
●Connection code 5BF.
●Connection code 5LW.
Between components R22 and the internal connector in the transmission.
Are the continuity and insulation correct?
If YES, contact the Techline.
If NO, replace the intermediate wiring harness between connector R22 and the internal connector in the
transmission.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
Page 112 of 162
AUTOMATIC TRANSMISSION
Fault finding - Interpretation of faults
23A
23A - 112V3 MR-372-J84-23A000$495.mif
AJ0 BVA
Vdiag No.: 04, 05
DF307
CONTINUED 6
Stage 6:
Disconnect the connector from lock-up/brake 1 solenoid valve, measure the resistance of lock-up/brake 1
solenoid valve between the following connections:
●Connection code 5BF.
●Connection code 5LW.
The resistance must be 5.3 ΩΩ Ω Ω
± 0.5 ΩΩ Ω Ω
at 20 ˚C.
Is the resistance correct?
If YES, move on to step 7.
If NO, replace the hydraulic distributor.
Step 7:
Measure the continuity and insulation of the following connections:
●Connection code 5BF.
●Connection code 5LW.
Between lock-up/brake 1 solenoid valve and the internal connector on the transmission.
Are the continuity and insulation correct?
If YES, contact the Techline.
If NO, replace the internal wiring harness on the automatic transmission.
Step 8:
Check the continuity and insulation of the following connection:
●Connection code 5LW between components 119 and 754.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If + after ignition feed is not present after checking the feeds and earths on the transmission computer, contact
the Techline.
AFTER REPAIRDeal with any other faults. Clear the fault memory.
Switch off the ignition, wait 1 minute and carry out a road test followed by another
check with the diagnostic tool.
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