Mazda 6 Workshop Manual page 222

Diagnostic Procedure
STEP
1 Note
• The following test should be performed for
the vehicles with immobilizer system. Go
to Step 10 for the vehicles without
immobilizer system.
Connect the WDS or equivalent to the DLC-2.
Do the following conditions appear?
• The engine is not completely started.
• DTC B1681 is displayed.
2 Is the coil connector securely connected to the
coil?
3 Does the security light illuminate?
4 Connect the WDS or equivalent to the DLC-2
and retrieve the DTC.
DTC
B1213, B1342, B1600, B1601, B1602, B1681,
B2103, B2431
5 Is there continuity between PCM GND terminals
65, 85, 103, 104 and GND?
6 Measure the voltage between PCM GND
terminals 65, 85, 103, 104 and coil terminal C.
Is the voltage below 1.0?
7 Turn the engine switch to the ON position.
Access the VPWR PID.
Is the VPWR PID normal?
Specification
Battery voltage
8 Disconnect the coil connector.
Turn the engine switch to the ON position.
Is there battery voltage at coil connector terminal
D (harness-side)?
9 Is there continuity between PCM terminal 57 and
the starter relay?
10 Inspect for the following:
• Fuel quality (such as water contamination,
winter/summer blend)
• Fuel line/fuel filter clogging
• Intake-air system restriction
Are all items normal?
11 Note
• Ignore DTC P0122, P0123, P0222 or
P0223 while performing this test.
Disconnect the accelerator position sensor
connector.
Measure the voltage at the accelerator position
sensor connector VREF terminal (terminal D)
with the engine switch at ON position.
Specification
4.5—5.5 V
Is the voltage normal?
F2–210
TROUBLESHOOTING
INSPECTION RESULTS
Yes Both conditions appear:
Go to Step 4.
No Either or other condition appears:
Go to the next step.
Yes Go to the next step.
No Connect the coil connector securely.
Return to Step 1.
Yes Go to the next step.
No Inspect the instrument cluster and the wiring harness.
Yes Go to the appropriate DTC test.
No Go to the next step.
Yes Go to the next step.
No Repair or replace the wiring harness.
Yes Go to the next step.
No Repair or replace the wiring harness.
Yes Go to the next step.
No Repair or replace the wiring harness.
Yes Inspect for the following:
• Open or short circuit between coil terminal A and
PCM terminal 80
• Open or short circuit between coil terminal B and
PCM terminal 28
No Repair or replace the wiring harness between coil
connector terminal D and the fuse panel.
Yes Go to the next step.
No Repair or replace the wiring harness.
Yes Go to the next step.
No Service if necessary.
Repeat Step 10.
Yes Go to the next step.
No Go to the symptom troubleshooting "NO.26
CONSTANT VOLTAGE".
ACTION