DTC Troubleshooting

WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.

DTC DIAGNOSTIC TROUBLESHOOTING CHART

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 .
2	Is there a DTC related to TP sensor (DTC P0122 and P0123)?	Go to DTC P0122: Throttle Position Sensor Circuit Low and DTC P0123: Throttle Position Sensor Circuit High .	Go to Step 3.
3	Do you have SUZUKI scan tool?	Go to Step 4.	Go to Step 5.
4	Check TP sensor and its circuit Turn OFF ignition switch and connect SUZUKI scan tool to DLC. Turn ON ignition switch and check TP sensor output voltage when throttle valve is at idle position and fully opened. Check if voltage varies within specified value linearly as shown in the graph. Is check result satisfactory?	Substitute a known-good ECM and recheck.	Go to Step 6.
5	Check TP sensor and its circuit Remove ECM cover. Turn ON ignition switch. Check voltage at terminal "C51-3-9" of ECM connector connected, when throttle valve is at idle position and fully opened. Check if voltage varies within specified value linearly as shown in the graph. Is check result satisfactory?	If voltmeter was used, check terminal "C51-3- 9" for poor connection. If OK, substitute a known-good ECM and recheck.	Go to Step 6.
6	Check TP sensor Turn OFF ignition switch. Disconnect TP sensor connector. Check for proper connection to TP sensor at each terminal. If OK, check TP sensor for resistance referring to THROTTLE POSITION (TP) SENSOR ON-VEHICLE INSPECTION . Is check result satisfactory?	High resistance wire in "GRY/RED", "RED/GRN" or "GRY/YEL" circuit. If wire and connection are OK, substitute a known-good ECM and recheck.	Replace TP sensor.