Mazda CX-9 Grand Touring. Manual — part 236
2
Verify related Service Bulletins and/or
on-line repair information availability.
Is any related Service Bulletins
available?
Yes
If the vehicle is not repaired, go to the
next step.
No
Go to the next step.
3
INSPECT TP SENSOR CONNECTOR
FOR POOR CONNECTION
Turn the ignition switch off.
Disconnect the throttle body connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes
Repair or replace suspected part, then go to
Step 9.
No
Go to the next step.
4
INSPECT TP SENSOR CIRCUIT FOR
SHORT TO GROUND
Turn the ignition switch to the ON
position (Engine off).
Inspect for continuity between TP sensor
terminal F (wiring harness-side) and
body ground
Is there continuity?
Yes
Repair or replace suspected part, then go to
Step 9.
No
Go to the next step.
5
INSPECT PCM CONNECTOR FOR POOR
CONNECTION
Turn the ignition switch off.
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes
Repair or replace suspected part, then go to
Step 9.
No
Go to the next step.
6
INSPECT TP SIGNAL CIRCUIT FOR
OPEN CIRCUIT
Inspect for continuity between throttle
body connector terminal F (wiring
harness-side) and PCM terminal 2Z
(wiring harness-side).
Is there continuity?
Yes Go to the next step.
No
Repair or replace suspected part, then go to
Step 9.
7
INSPECT TP GROUND CIRCUIT FOR
OPEN CIRCUIT
Turn the ignition switch off.
Verify the continuity between TP sensor
terminal E (wiring harness-side) and
Yes Go to the next step.
Repair or replace suspected part, then go to
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 77
© 2005 Mitchell Repair Information Company, LLC.
DTC P0123 [MZI-3.7]
DTC P0123 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
PCM terminal 2AH (wiring harness-
side).
Is the continuity?
No
Step 9.
8
INSPECT TP SENSOR NO.1
Inspect the TP sensor No.1. (See
THROTTLE POSITION (TP)
SENSOR INSPECTION [MZI-3.7] .)
Is there any malfunction?
Yes
Replace the throttle body, then go to the next
step.
No
Go to the next step.
9
VERIFY TROUBLESHOOTING OF DTC
P0122 HAS BEEN COMPLETED
Make sure to reconnect all disconnected
connectors.
Clear the DTC from the PCM memory
using the M-MDS.
Start the engine.
Perform the "KOEO/KOER self-test".
(See KOEO/KOER SELF TEST [MZI-
3.7].)
Is same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
[MZI-3.7] .)
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
Perform the "AFTER REPAIR
PROCEDURE". (See AFTER REPAIR
PROCEDURE [MZI-3.7].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7].)
No
Troubleshooting completed.
DTC P0123
TP sensor No.1 circuit high input
DETECTION
CONDITION
The TP sensor No.1 circuit was flagged as a concern by the PCM indicating a
high voltage.
POSSIBLE CAUSE
TP sensor No.1 malfunction
Connector or terminal malfunction
Short to constant voltage supply circuit between throttle body terminal F and
PCM terminal 2Z
TP sensor signal circuits are shorted each other
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 78
© 2005 Mitchell Repair Information Company, LLC.
DIAGNOSTIC PROCEDURE
DTC P0123 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
Has FREEZE FRAME DATA been
recorded?
Yes Go to the next step.
No
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Yes Perform repair or diagnosis according to the
available Service Bulletins.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 79
© 2005 Mitchell Repair Information Company, LLC.
2
Verify related Service Bulletins and/or
on-line repair information availability.
Is any related Service Bulletins
available?
If the vehicle is not repaired, go to the
next step.
No
Go to the next step.
3
INSPECT TP SENSOR CONNECTOR
FOR POOR CONNECTION
Turn the ignition switch off.
Disconnect the throttle body connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes
Repair or replace suspected part, then go to Step
8.
No
Go to the next step.
4
INSPECT PCM CONNECTOR FOR
POOR CONNECTION
Turn the ignition switch off.
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes
Repair or replace suspected part, then go to Step
8.
No
Go to the next step.
5
INSPECT TP SIGNAL CIRCUIT FOR
SHORT TO POWER SUPPLY
Turn the ignition switch to the ON
position (Engine off).
Measure the voltage between Throttle
body connector terminal F (wiring
harness-side) and body ground.
Is the voltage B+?
Yes
Repair or replace suspected part, then go to Step
8.
No
Go to the next step.
6
INSPECT TP SENSOR SIGNAL
CIRCUITS FOR SHORT EACH OTHER
Disconnect the TP sensor and PCM
connector.
Measure resistance between Throttle
body connector terminal D and F
Is the resistance more than 10
kilohms?
Yes Go to the next step.
No
Repair or replace suspected part, then go to Step
8.
7
INSPECT TP SENSOR NO.1
Inspect the TP sensor No.1. (See
THROTTLE POSITION (TP)
SENSOR INSPECTION [MZI-3.7] .)
Yes
Replace the throttle body, then go to the next
step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:35 AM
Page 80
© 2005 Mitchell Repair Information Company, LLC.
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