No.27 Constant Voltage - Mazda 6 2002 Workshop Manual

End Of Sie

NO.27 CONSTANT VOLTAGE

27 CONSTANT VOLTAGE
DESCRIPTION Incorrect constant voltage
• Constant voltage circuit malfunction
POSSIBLE CAUSE
Note
• TP sensor uses constant voltage.
Diagnostic procedure
STEP INSPECTION
1 Disconnect TP sensor connector where constant
voltage circuit inspection failed.
Turn ignition switch to ON position.
Measure voltage between following TP sensor
connector terminals:
• Constant voltage terminal - GND terminal
Is constant voltage greater than 6.0 V?
2 Is voltage across battery terminals greater than
10.5 V?
3 Turn ignition switch off.
Leave TP sensor connector disconnected.
Measure voltage between battery positive
terminal and GND (between PCM and TP
sensor) circuit at appropriate sensor connector.
Is voltage greater than 10.5 V and within 1.0 V
of battery voltage?
4 Note
• Purpose of this step is to determine if
WDS or equivalent is communicating with
PCM.
Turn ignition switch to ON position.
Attempt to access ECT PID.
Can ECT PID be accessed?
5 Turn ignition switch off.
Disconnect TP sensor and PCM connectors.
Turn ignition switch to ON position.
Measure voltage between PCM connector
terminals 2Y and 2AB.
Is voltage greater than 10.5 V?
6 Leave TP sensor and PCM connectors
disconnected.
Measure resistance between PCM connector
terminals 2Y and 2AB.
Is resistance greater than 10,000 ohms?
7 Turn ignition switch off.
Leave TP sensor disconnected.
Disconnect PCM connector.
Measure resistance between PCM connector
terminal 2K and constant voltage circuit at
appropriate sensor connector.
Is resistance less than 5.0 ohms?
8 Note
• Purpose of this step is to determine if
WDS or equivalent is communicating with
PCM.
Reconnect TP sensor connector.
Turn ignition switch to ON position.
Attempt to access ECT PID.
Can ECT PID be accessed?
TROUBLESHOOTING
RESULTS
Yes Go to Step 13.
No Go to net step.
Yes Go to net step.
No Inspect charging system.
Yes Go to net step.
No Go to Step 8.
Yes Go to Step 7.
No Go to net step.
Yes Go to net step.
No Repair open circuit between PCM terminal 2Y and
main relay.
Yes Inspect for constant voltage at suspect sensor
connector again.
No Repair constant voltage circuit short to GND.
Yes Inspect for constant voltage at suspect sensor
connector again.
No Repair open constant voltage circuit.
Yes Go to net step.
No Go to Step 11.
A6E398018881W29
ACTION
F–223
F