Mazda Mazda6 Workshop Manual Supplement page 378

STEP
8 Note
• Purpose of this step is to determine if
WDS or equivalent is communicating with
PCM.
Reconnect appropriate sensor connector.
Turn engine switch to ON.
Attempt to access ECT PID.
Can ECT PID be accessed?
9 Are DTCs present for two or more sensors
connected to PCM terminal 91?
Sensor connected to PCM terminal 91:
• Accelerator position sensor. (P0122, P0123,
P0222, P0223).
• ECT sensor (P0117, P0118)
• Fuel pressure sensor (P0192, P0193)
• Fuel temperature sensor (P0182, P0183)
• MAF/IAT sensor (P0102, P0103, P0112,
P0113)
• IAT sensor No.2 (P0097, P0098)
10 Turn engine switch to OFF.
Disconnect WDS or equivalent from DLC-2.
Disconnect PCM connector.
Measure resistance between GND circuit at
appropriate sensor connector and PCM
connector terminal 91.
Is resistance less than 5.0 ohms?
11 Turn engine switch OFF.
Disconnect PCM connector.
Measure resistance between battery negative
terminal and PCM terminals 65, 85, 103 and
104.
Is each resistance less than 5.0 ohms?
12 Turn engine switch to OFF.
Measure resistance between GND circuit at
following sensor connector and GND:
• Accelerator position sensor
• ECT sensor
• BARO sensor
• Fuel pressure sensor
• Fuel temperature sensor
• MAF/IAT sensor
• IAT sensor No.2
Is resistance below 5.0 ohms?
13 Turn engine switch to OFF.
Disconnect accelerator position sensor.
Turn engine switch to ON.
Measure voltage between constant voltage
circuit at accelerator position sensor and battery
negative terminal.
Is voltage less than 0.5V?
14 Verify test results.
• If okay, return to diagnostic index to service any additional symptoms.
• If malfunction remains, replace PCM. (See
End Of Sie
F2–226
TROUBLESHOOTING
INSPECTION RESULTS
Yes Go to next step.
No Go to Step 11.
Yes Go to next step.
No Repair open GND circuit to sensor where constant
voltage circuit inspection failed.
Yes Reconnect sensor connector.
Go to appropriate DTC test.
No Repair open GND circuit.
Yes Go to next step.
No Repair open GND circuit.
Yes GND circuits are okay.
Inspect sensor connector for constant voltage again.
No Inspect for open GND circuit.
Yes Inspect sensor connector for constant voltage again.
No Repair constant voltage circuit shorted power in
harness.
F2–64 PCM REMOVAL/INSTALLATION)
ACTION