Mazda 6 2002, Workshop Manual

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F–192
TROUBLESHOOTING
4 Does security light illuminate? Yes Go to next step.
No Inspect instrument cluster and wiring harness.
5 Connect WDS or equivalent to DLC-2 and
retrieve DTC.
Are any of following DTCs displayed?
DTC
B1213, B1342, B1600, B1602, B1681, B2103,
B2431
Yes Go to appropriate DTC test.
No Go to next step.
6 Is there continuity between PCM GND terminals
4X, 2AB, 2AC and GND? Yes Go to next step.
No Repair or replace wiring harness.
7 Measure voltage between PCM GND terminals
4X, 2AB, 2AC and coil terminal C.
Is voltage
below 1.0 V ?
Yes Go to next step.
No Repair or replace wiring harness.
8 Turn ignition switch to ON position.
Access VPWR PID.
Is VPWR PID okay?
VPWR PID
Battery voltage
Yes Go to next step.
No Repair or replace wiring harness.
9 Disconnect coil connector.
Turn ignition switch to ON position.
Is there battery voltage at coil connector terminal
D? Yes Inspection for following:
•
Open or short circuit between coil terminal A and
PCM terminal 2Q.
•
Open or short circuit between coil terminal B and
PCM terminal 2T.
No Repair or replace wiring harness between coil
connector terminal D and fuse panel.
10 Verify following:
•
Vacuum connection
•
Air cleaner element
•
No air leakage from intake-air system
•
No restriction of intake-air system
•
Proper sealing of intake manifold and
components attached to intake manifold:
EGR valve, IAC valve
•
Ignition wiring
•
Fuel quality: proper octane, contamination,
winter/summer blend
•
Electrical connections
•
Smooth operation of throttle valve
Are all items okay?
Yes Go to next step.
No Service as necessary.
Repeat Step 10.
11 Turn ignition switch to ON position.
Disconnect TP sensor connector.
Measure voltage at TP sensor connector VREF
terminal with ignition switch ON.
Voltage
4.5—5.5 V
Is voltage okay?
Yes Go to next step.
No Go to troubleshooting "No.27 Constant voltage".
12 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory, KOEO and
KOER DTCs.
If engine stalls, retrieve continuous memory and
KOEO DTCs.
Are there any DTC displayed? Yes DTC is displayed:
Go to appropriate DTC test.
Communication error message is displayed:
Inspect for following:
•
Open circuit between main relay and PCM terminal
2Y or 4V
•
Open main relay GND circuit
•
Main relay is stuck open.
•
Open or poor GND circuit (PCM terminal 4X, 2AB
or 2AC)
•
Poor connection of vehicle body GND
No No DTC is displayed:
Go to next step.
13 Attempt to start engine at part throttle.
Does engine run smoothly at part throttle? Yes Inspect IAC valve and wiring harness.
No Go to next step.
STEP INSPECTION RESULTS ACTION