TROUBLESHOOTING GUIDE
F-43flowchartTroubleshooting Guide (Steps 5-11)
1
Check if ECU terminal voltages are OK (2D, 2O and 2Q) (page F-129)
No
Check for cause (Refer to 'Check Point for Each Terminal') (page F-132)
Yes
2
Go to next step
3
Check if strong blue spark is visible at each disconnected high-tension lead while cranking engine
No
Check ignition system (Refer to Troubleshooting 'Misfire') (page G-18)
Yes
4
Go to next step
5
Check for injector operating sound at each injector at idle
No
Go to Step 8
Go to Step 8
Check if approx. 12V exists at injector connector (W/R) wire with ignition switch ON
Yes
6
Go to Step 9
7
Check if spark plugs are OK. Plug gap: 1.0-1.1 mm (0.039-0.043 in)
No
Repair or replace (page G-20)
Yes
8
Go to next step
9
Connect diagnosis connector terminals F/P and GND with jumper wire and check for correct fuel line pressure with ignition switch ON (page F-103). Fuel line pressure: 265-314 kPa (2.7-3.2 kgf/cm², 38-46 psi)
No
Low pressure: Check fuel line pressure while pinching fuel return hose. If fuel line pressure quickly increases, check pressure regulator (page F-111). If fuel line pressure gradually increases, check for clogging between fuel pump to pressure regulator. If not clogged, check for fuel pump maximum pressure (page F-108)
Low pressure: Check fuel line pressure while pinching fuel return hose. If fuel line pressure quickly increases, check pressure regulator (page F-111). If fuel line pressure gradually increases, check for clogging between fuel pump to pressure regulator. If not clogged, check for fuel pump maximum pressure (page F-108)
Yes
10
Go to next step
11
Try known good ECU and check if condition improves (page F-127)
See also
F-7OUTLINE - WIRING DIAGRAMF-103FUEL SYSTEMF-108FUEL SYSTEMF-111PRESSURE REGULATORF-112FUEL SYSTEMF-127CONTROL SYSTEM - Engine Control Unit InspectionF-129CONTROL SYSTEM - Engine Control Unit Terminal Voltage Table (continued)F-132CONTROL SYSTEM - Check Point for Each Terminal (continued)G-18IGNITION SYSTEM — TROUBLESHOOTINGG-20IGNITION SYSTEM — SPARK PLUG