13A-23
MPI – TROUBLESHOOTING
Continued from the previous page
Measure at the air temperature
sensor connector B-34
• Connect the test harness
(MB991658), to the connector
and measure at the pick-up
harness component.
• Ignition switch: ON
•Voltage across earth at 1
OK:
surrounding temperature -20ºC
3.8~4.4V
surrounding temperature 0ºC
3.2~3.8V
surrounding temperature 20ºC
2.3~2.9V
surrounding temperature 40ºC
1.5~2.1V
surrounding temperature 60ºC
0.8~1.4V
surrounding temperature 80ºC
0.4~1.0V
Check that the problem has been
solved
Replace the engine ECU
Inspect the harness between the
air temperature sensor and the
engine ECU and repair it if
necessary.
• Check if the earth wire is
damaged
Check connector: C-51
Temporary malfunction (Ref
Section 00: Dealing with
temporary malfunctions)
OK
OK
OK
NG
NG
OK
NG
Repair
