Mazda CX-7 2007 Workshop Manual page 255

Diagnostic procedure
STEP
1 VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has the FREEZE FRAME DATA been
recorded?
2 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Bulletins and/or on-
line repair information availability.
• Is any related repair information available?
3 CLASSIFY APP SENSOR OR HARNESS
MALFUNCTION
• Connect the M-MDS.
• Access the APP2 PID.
• Disconnect the throttle body connector.
• Connect a jumper wire between APP sensor
terminals A and C (harness-side).
• Is the PID approx. 100%?
4 INSPECT APP SENSOR
• Perform the APP sensor inspection.
(See01-40-33 ACCELERATOR PEDAL
POSITION (APP) SENSOR INSPECTION[L3
WITH TC].)
• Is the APP sensor normal?
5 INSPECT POWER SUPPLY CIRCUIT VOLTAGE
AT APP SENSOR CONNECTOR
• Turn ignition switch to the ON position (Engine
off).
• Measure the voltage at APP sensor terminal A
(harness-side).
• Is the voltage within 4.5— 5.5 V?
6 VERIFY APP2 SIGNAL CIRCUIT FOR OPEN
CIRCUIT
• Turn the ignition switch to off.
• Inspect for continuity between APP sensor
terminal C (harness-side) and PCM terminal
1AC (harness-side).
• Inspect for continuity between APP sensor
terminal A (harness-side) and PCM terminal
1AT (harness-side).
• Is there continuity?
7 VERIFY APP2 SIGNAL CIRCUIT FOR SHORT
TO GROUND
• Inspect for continuity between APP sensor
terminal C (harness-side) and body ground.
• Is there continuity?
8 VERIFY TROUBLESHOOTING OF DTC P2127
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Turn ignition switch to the ON position (Engine
off).
• Clear the DTC from the PCM memory using
the M-MDS.
• Start engine and warm it up completely.
• Is the same DTC present?
9 VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
(See01-14-4 AFTER REPAIR
PROCEDURE[L3 WITH TC].)
• Are any DTCs present?
End Of Sie
ON-BOARD DIAGNOSTIC [L3 WITH TC]
INSPECTION
Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair order, then go
to the next step.
Yes Perform the repair or diagnosis according to the available
repair information.
• If the vehicle is not repaired, go to the next step.
No Go to the next step.
Yes Go to the next step.
No Go to step 5.
Yes Inspect for poor APP sensor connector terminal A
connection. Repair or replace if necessary, then go to Step
8.
No Replace the APP sensor, then go to Step 8.
Yes Go to the next step.
No Repair or replace for an open circuit between APP sensor
connector terminal A and PCM connector terminal 1AJ
(harness-side).
Then, then go to Step 8.
Yes Go to the next step.
No Repair or replace the suspected wiring harness, then go to
Step 8.
Yes Repair or replace the suspected wiring harness, then go to
the next step.
No Go to the next step.
Yes Replace the PCM, then go to the next step.
(See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH
TC].)
No Go to the next step.
Yes Go to the applicable DTC inspection.
(See01-02-13 DTC TABLE[L3 WITH TC].)
No Troubleshooting completed.
ACTION
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01-02