TP Switch Signal Faulty at Idle

EH. DIAGNOSTIC TROUBLE CODE (DTC) 1-3-3 MFI LH 2.4

1-3-3 Throttle position (TP) switch signal faulty on idling

DTC Conditions

The control module interprets a signal from the idle switch when engine speed is above 1500 rpm and at part loads indicating that the engine cannot idle.

Causes of fault:




Grounding in the control module wiring. The idle switch will not cut out.

Fault symptoms:

Above normal idling speed.

EH1

Checking The Idle Switch

-Turn the throttle pulley a little and listen to hear if the idle switch clicks.




If the switch clicks:

-DTM 2 EH2.

If the switch does not click:

-WC. Adjust the TP switch.

EH2

Diagnostic Test Mode (DTM) 2

-Go into DTM 2 and check the TP switch in accordance with CB1 and CB5.

Entering Control Function #2:

If code 3-3-2 is received:

Intermittent fault.

-Check the wiring between terminal 2 in the TP switch connector and MFI #2 as well as terminal 2 in the connector and DI #7 for intermittent grounding.

-Clean the TP switch connector and treat it for corrosion.

If code 3-3-2 is not received:

-Checking the TP switch EH3.

EH3

Checking The Throttle Position (TP) Switch




-Ignition off.

-Disconnect the TP switch.

Connect an ohmmeter between terminals 18 and 2 on the TP switch.

The ohmmeter should read approx. 0 OHMS.

-Open the throttle a little.

The ohmmeter should read infinite resistance.

If both readings are OK:

-Check the wiring between terminal 2 in the TP switch connector and MFI #2, as well as terminal 2 in the connector and DI #7, for grounding.

-Clean the TP switch connector and treat it for corrosion.

If either or both of the readings are incorrect:

-Try using a new TP switch.