Mazda Mazda6 - No.28 Gear Position Indicator Light Illuminates in D Range or in P, N, R Positions; No.30 Does Not Shift down in M Range

TROUBLESHOOTING
K2–201
K2
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NO.28 GEAR POSITION INDICATOR LIGHT ILLUMINATES IN D RANGE OR IN P, N, R POSITIONS
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Diagnostic procedure
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NO.29 DOES NOT SHIFT UP IN M RANGE
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NO.30 DOES NOT SHIFT DOWN IN M RANGE
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2 • Inspect MNL SW PID value using WDS or
equivalent.
• Are these PIDs okay?
Yes Inspect instrument cluster.
No Inspect M range switch.
If M range switch is okay, inspect for continuity between M
range switch and TCM terminal 1AA.
3 • Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
STEP INSPECTION ACTION
28 Gear position indicator light illuminates when D range or P, N, R positions
DESCRIPTION
• Gear position indicator light in instrument cluster illuminates in D range or P, N, R positions and ignition
switch at on.
POSSIBLE
CAUSE
• M range switch or related wiring harness malfunction.
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board Diagnostic
and Automatic Transaxle Basic Inspection are conducted.
STEP INSPECTION ACTION
1 • Inspect MNL SW PID value using WDS or
equivalent.
• Are these PIDs okay?
Yes Inspect instrument cluster.
No Inspect M range switch.
If M range switch is okay, inspect for continuity between M
range switch and TCM terminal 1AA.
2 • Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, inspect related Service Informations and perform repair or diagnosis.
— If vehicle repaired, troubleshooting completed.
— If vehicle not repaired or additional diagnostic information not available, replace TCM.
29 Does not shift up in M range
DESCRIPTION
• Gear position indicator light in instrument cluster illuminates, but vehicle does not upshift when selector
lever is pushed to “+” side.
POSSIBLE
CAUSE
• Up switch or related harness malfunction
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted.
30 Does not shift up in M range
DESCRIPTION
• Gear position indicator light in instrument cluster illuminates, but vehicle does not downshift when
selector is pushed lever to “–” side.
POSSIBLE
CAUSE
• Down switch or related harness malfunction
Note
• Before following troubleshooting steps, make sure that Automatic Transaxle On-Board
Diagnostic and Automatic Transaxle Basic Inspection are conducted.