Mazda 6 2002 Workshop Manual page 289

STEP
4 Does security light illuminate?
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
6 Is there continuity between PCM GND terminals
4X, 2AB, 2AC and GND?
7 Measure voltage between PCM GND terminals
4X, 2AB, 2AC and coil terminal C.
Is voltage below 1.0 V?
8 Turn ignition switch to ON position.
Access VPWR PID.
Is VPWR PID okay?
VPWR PID
Battery voltage
9 Disconnect coil connector.
Turn ignition switch to ON position.
Is there battery voltage at coil connector terminal
D?
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?
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?
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?
13 Attempt to start engine at part throttle.
Does engine run smoothly at part throttle?
F–192
TROUBLESHOOTING
INSPECTION RESULTS
Yes Go to net step.
No Inspect instrument cluster and wiring harness.
Yes Go to appropriate DTC test.
No Go to net step.
Yes Go to net step.
No Repair or replace wiring harness.
Yes Go to net step.
No Repair or replace wiring harness.
Yes Go to net step.
No Repair or replace wiring harness.
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.
Yes Go to net step.
No Service as necessary.
Repeat Step 10.
Yes Go to net step.
No Go to troubleshooting "No.27 Constant voltage".
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 net step.
Yes Inspect IAC valve and wiring harness.
No Go to net step.
ACTION