ON-BOARD DIAGNOSTIC
F2–115
F2
DTC P0121
A6E407001082216
Diagnostic procedure
DTC P0121 Accelerator position sensor No.1 circuit performance problem
DETECTION
CONDITION
• PCM monitors input voltage from accelerator position sensor No.1 while engine is running. If input voltage
from accelerator position sensor No.1 is above 1.3 V when accelerator pedal is depressed, PCM
determines accelerator position sensor No.1 circuit performance problem.
POSSIBLE
CAUSE
• Accelerator position sensor No.1 malfunction
• Connector or terminal malfunction
• Voltage drops in GND circuit
• Accelerator position sensor misadjustment
• PCM malfunction
ACCELERATOR POSITION SENSOR NO.1
4
90
10
91
PCM
DCB
A
91
90
10
A
B
D
3
5
2
2
2
5
5
ACCELERATOR POSITION SENSOR
HARNESS SIDE CONNECTOR
PCM
HARNESS SIDE CONNECTOR
STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related repair information available?
Yes Perform repair or diagnosis according to available Service
Information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 INSPECT POOR CONNECTION OF
ACCELERATOR POSITION SENSOR NO.1
CONNECTOR
• Turn engine switch to OFF.
• Inspect for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
• Is there any malfunction?
Yes Repair or replace suspected terminal, go to Step 6.
No Go to next step.
3 INSPECT ACCELERATOR POSITION SENSOR
NO.1 GND CIRCUIT FOR VOLTAGE DROP
• Turn engine switch to OFF.
• Inspect resistance between accelerator
position sensor terminal D and body GND.
• Is resistance approx. 0 ohm?
Yes Go to next step.
No Repair or replace suspected terminal, go to Step 6.
4 INSPECT ACCELERATOR POSITION SENSOR
NO.1
• Inspect accelerator position sensor No.1.
(See F2–72 ACCELERATOR POSITION
SENSOR INSPECTION)
• Is there any malfunction?
Yes Adjust or replace accelerator position sensor, go to Step 6.
(See F2–73 ACCELERATOR POSITION SENSOR
ADJUSTMENT)
(See F2–44 ACCELERATOR PEDAL COMPONENT
DISASSEMBLY/ASSEMBLY)
No Go to next step.
To Next Page