Mazda 6 2002, Workshop Manual

Page: 326 / 1248

F–196
TROUBLESHOOTING
3 Is coil connector securely connected to coil? Yes Go to next step.
No Connect coil connector securely.
Return to Step 2.
4 Does security light illuminate? Yes Go to next step.
No Inspect instrument cluster and wiring harness.
5 Connect WDS equivalent to DLC-2 and retrieve
DTC.
Are any of following DTCs displayed?
DTC
B1213, B1342, B1600, B1601, 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 Inspect 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
•
External fuel shut off or accessory (kill
switch, alarm etc.)
•
Fuel quality: proper octane, contamination,
winter/summer blend
•
No air leakage from intake-air system
•
Proper sealing of intake manifold and
components attached to intake manifold:
EGR valve, IAC valve
•
Ignition wiring
•
Electrical connections
•
Fuses
•
Smooth operation of throttle valve
Are all items okay?
Yes Go to next step.
No Service as necessary.
Repeat Step 10.
11 Connect WDS or equivalent to DLC-2.
Retrieve any continuous memory and KOEO
DTC.
Are there any DTCs 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.
12 Turn ignition switch to ON position.
Disconnect TP sensor connector.
Measure voltage at TP sensor connector VREF
terminal with ignition switch to ON position.
Voltage
4.5—5.5 V
Is voltage okay?
Yes Go to next step.
No Go to troubleshooting "No.27 Constant voltage".
13 Does engine start with throttle closed? Yes Go to Step 29.
No Go to next step.
STEP INSPECTION RESULTS ACTION