Suzuki Grand Vitara JB416 / JB420 / JB419. Service manual - part 65

1A-207 Engine General Information and Diagnosis: For Petrol Engine Model

DTC P2127: Pedal Position Sensor (Sub) Circuit Low Input

S6JB0A1114075

Wiring Diagram
Refer to “DTC P2122: Pedal Position Sensor (Main) Circuit Low Input: For Petrol Engine Model”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool. 
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.

9

Ground circuit check
1) Remove ECM from its bracket with ECM connectors 

connected.

2) Check for proper connection of ECM connector at “E23-

54” terminal.

3) If OK, measure resistance between “E23-54” terminal of 

ECM connector and engine ground.

Is resistance below 3 

Ω

?

“ORN” wire is open or 
high resistance circuit.

Faulty ECM ground 
circuit. If circuit is OK, 
substitute a known-
good ECM and recheck.

10 Accelerator pedal position (APP) sensor assembly 

check
1) Check accelerator pedal position sensor (main) referring 

to “Accelerator Pedal Position (APP) Sensor Assembly 
Inspection: For Petrol Engine Model in Section 1C”.

Is output voltage within specified value?

Substitute a known-
good ECM and recheck.

Replace accelerator 
pedal position (APP) 
sensor assembly.

Step

Action

Yes

No

DTC detecting condition

Trouble area

Output voltage of accelerator pedal position sensor (sub) 
is less than 0.2 V for 0.5 seconds continuously.
(1 driving detection logic)

• Accelerator pedal position (APP) sensor (sub) circuit
• Accelerator pedal position (APP) sensor assembly
• ECM
• Incorrect mounting of accelerator pedal (APP) sensor 

assembly

Engine General Information and Diagnosis: For Petrol Engine Model 1A-208

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting: For Petrol Engine Model”.

 

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check: For 
Petrol Engine Model”.

2

Accelerator pedal position (APP) sensor assembly 
mounting check
1) Check that accelerator pedal position (APP) sensor 

assembly has been mounted to vehicle body properly 
(no pinched floor carpet, etc).

Is it OK?

Go to Step 3.

Reinstall accelerator 
pedal position (APP) 
sensor assembly 
properly referring to 
“Accelerator Pedal 
Position (APP) Sensor 
Assembly Removal and 
Installation: For Petrol 
Engine Model in Section 
1C”.

3

Accelerator pedal position sensor (sub) and its circuit 
check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ON ignition switch, check “APP Sensor 2 Volt” 

displayed on scan tool.

Is displayed voltage below 0.1 V?

Go to Step 4.

Intermittent trouble.
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.

4

ECM voltage check
1) Disconnect connector from accelerator pedal position 

(APP) sensor assembly with ignition switch turned OFF.

2) Check for proper connection to accelerator pedal 

position (APP) sensor assembly at “ORN/BLU”, “BLU/
GRN” and “BLU/YEL” wire terminals.

3) If OK, measure voltage between “ORN/BLU” wire 

terminal of accelerator pedal position (APP) sensor 
assembly connector and vehicle body ground with 
ignition switch turned ON.

Is voltage 4 – 6 V?

Go to Step 7.

Go to Step 5.

“BLU/GRN”

“BLU/YEL”

“ORN”

“WHT/BLU”

“WHT”

“ORN BLU”

I5JB0A110071-01

1A-209 Engine General Information and Diagnosis: For Petrol Engine Model

5

ECM voltage check
1) Turn OFF ignition switch.
2) Remove ECM from its bracket with ECM connectors 

connected.

3) Check for proper connection of ECM connector at “E23-

53” terminal.

4) If OK, measure voltage between “E23-53” terminal of 

ECM connector and engine ground with ignition switch 
turned ON.

Is voltage 4 – 6 V?

“ORN/BLU” wire is open 
or high resistance 
circuit.

Go to Step 6.

6

Wire harness check
1) Disconnect connectors from ECM with ignition switch 

turned OFF.

2) Measure resistance between “E23-53” terminal of ECM 

connector and engine ground.

Is resistance infinity?

Substitute a known-
good ECM and recheck.

“ORN/BLU” wire is 
shorted to ground 
circuit.

7

Wire harness check
1) Disconnect connectors from ECM with ignition switch 

turned OFF.

2) Check for proper connection of ECM connector at “E23-

54”, “E23-52” and “E23-51” terminals.

3) If OK, measure resistance between “BLU/GRN” wire 

terminal of accelerator pedal position (APP) sensor 
assembly connector and vehicle body ground.

Is resistance infinity?

Go to Step 8.

“BLU/GRN” wire is 
shorted to ground 
circuit.

8

Wire harness check
1) Measure resistance between “E23-52” and each “E23-

54”, “E23-51” terminals of ECM connector with ignition 
switch turned OFF.

Is each resistance infinity?

Go to Step 9.

“BLU/GRN” wire is 
shorted to “ORN” wire 
and/or “BLU/YEL” wire 
circuit.

9

Wire harness check
1) Measure resistance between “BLU/GRN” wire terminal 

of accelerator pedal position (APP) sensor assembly 
connector and “E23-52” terminal of ECM connector with 
ignition switch turned OFF.

Is resistance below 3 

Ω

?

Go to Step 10.

“BLU/GRN” wire is open 
or high resistance 
circuit.

10 Accelerator pedal position (APP) sensor assembly 

check
1) Check accelerator pedal position sensor (sub) referring 

to “Accelerator Pedal Position (APP) Sensor Assembly 
Inspection: For Petrol Engine Model in Section 1C”.

Is output voltage within specified value?

Substitute a known-
good ECM and recheck.

Replace accelerator 
pedal position (APP) 
sensor assembly.

Step

Action

Yes

No

Engine General Information and Diagnosis: For Petrol Engine Model 1A-210

DTC P2128: Pedal Position Sensor (Sub) Circuit High Input

S6JB0A1114076

Wiring Diagram
Refer to “DTC P2122: Pedal Position Sensor (Main) Circuit Low Input: For Petrol Engine Model”.

DTC Detecting Condition and Trouble Area

DTC Confirmation Procedure

1) With ignition switch turned OFF, connect scan tool. 
2) Turn ON ignition switch and clear DTC using scan tool.
3) Keep the accelerator pedal at idle position for 2 seconds.
4) Keep the accelerator pedal at fully depressed position for 2 seconds.
5) Repeat Step 3) and 4) for 3 times.
6) Check DTC.

DTC Troubleshooting

NOTE
Before this trouble shooting is performed, read the precautions for DTC troubleshooting referring to 
“Precautions for DTC Troubleshooting: For Petrol Engine Model”.

 

DTC detecting condition

Trouble area

Output voltage of accelerator pedal position sensor (sub) 
is more than 4.8 V for 0.5 seconds continuously.
(1 driving detection logic)

• Accelerator pedal position (APP) sensor (sub) circuit
• Accelerator pedal position (APP) sensor assembly
• ECM
• Incorrect mounting of accelerator (APP) sensor 

assembly

Step

Action

Yes

No

1

Was “Engine and Emission Control System Check” 
performed?

Go to Step 2.

Go to “Engine and 
Emission Control 
System Check: For 
Petrol Engine Model”.

2

Accelerator pedal position (APP) sensor assembly 
mounting check
1) Check that accelerator pedal position (APP) sensor 

assembly has been mounted to vehicle body properly 
(no pinched floor carpet, etc).

Is it OK?

Go to Step 3.

Reinstall accelerator 
pedal position (APP) 
sensor assembly 
properly referring to 
“Accelerator Pedal 
Position (APP) Sensor 
Assembly Removal and 
Installation: For Petrol 
Engine Model in Section 
1C”.

3

Accelerator pedal position sensor (sub) and its circuit 
check
1) Connect scan tool to DLC with ignition switch turned 

OFF.

2) Turn ON ignition switch, check “APP Sensor 2 Volt” 

displayed on scan tool.

Is displayed voltage 4.8 V or more?

Go to Step 4.

Intermittent trouble.
Check for intermittent 
referring to “Intermittent 
and Poor Connection 
Inspection in Section 
00”.