1A
DTC P0170: Fuel Trim
NOTE:
• This DTC indicated only with SUZUKI scan tool.
• Priority when dealing with a number DTCs:
If DTC P0170 and either one of DTC P0089, P0200, P0201, P0202, P0203 or P0204 are detected, deal with DTC “P0089 Fuel pressure regulator performance problem”, “P0200 Injector control circuit”, “P0201 Cylinder 1 injector control circuit”, “P0202 Cylinder 2 injector control circuit”, “P0203 Cylinder 3 injector control circuit” or “P0204 Cylinder 4 injector control circuit” first.
Wiring Diagram
For wiring circuit and connector number, refer to “K9K Engine (Type 5)” in A-4 Engine Control System Circuit Diagram .
Driving Cycle for Troubleshooting
Before starting troubleshooting, carry out the following driving cycle.
Perform the following: (idle)
• Engine running at idle speed for 30 seconds
• Engine speed < 1000 rpm
• Injected quantity < 10 mg/stroke
• Rail pressure: between 270 bar and 300 bar
• Vehicle speed < 3 km/h
• Engine coolant temperature > 79 °C
• Intake air temperature: between 10 °C and 50 °C
• Fuel temperature: between 10 °C and 57 °C
• Battery voltage: between 10 V and 16 V
• Barometric pressure > 90 kPa
Perform the following: (Running)
• Engine running at idle speed for 30 seconds
• Engine speed: between 1250 rpm and 3500 rpm
• Injected quantity: betwee15 mg/stroke and 30 mg/stroke
• Rail pressure: between 350 bar and 1450 bar
• Vehicle speed: no limit
• Engine coolant temperature > 65 °C
• Intake air temperature: between 0 °C and 150 °C
• Fuel temperature: between –50 °C and 150 °C
• Battery voltage: between 10 V and 16 V
• Barometric pressure > 80 kPa
If DTC P0170 is still detected, go to trouble shooting.
Troubleshooting
Check that the fuel injector calibration codes are correctly entered on the ECM.
Check the connection and condition of the ECM “C47” connector and “C47-9” terminal of knock sensor shielding.
Check that the knock sensor is secured on the engine.
After retightening the knock sensor, initialize the fuel pressure value by using “Initialize High Pressure Pump” under “Miscellaneous test” (“MISC TEST”) of SUZUKI scan tool.
After Repair
Deal with any faults detected by SUZUKI scan tool.
Clear the DTC.
Carry out a road test followed by another check with the SUZUKI scan tool.