DTC 22

Code 22 Chart:

Sensor Wiring Circuits:

CIRCUIT DESCRIPTION
The Throttle Position (TP) Sensor provides a voltage signal that changes relative to throttle blade angle. Signal voltage will vary from about 0.5 at idle to above 4 volts at wide open throttle. The TP signal is one of the most important inputs used by the PCM for fuel control and for most of the PCM control outputs.

Code 22 will set if:
^ The ignition key is "ON"
^ TP signal voltage is less than 0.16 volts for 4 seconds.


TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.

1. Determines if condition necessary for setting Code 22 exists.

2. Simulates Code 21: (high voltage) If PCM recognizes the high signal voltage the PCM and wiring are OK.

3. With closed throttle, ignition "ON" or at idle, voltage at TP sensor should be 0.2 - 0.74 volt as read with a Scan tool. If sensor if not within specifications, replace sensor.

4. Simulates a high signal voltage. Checks CKT 417 for an open.

DIAGNOSTIC AIDS:

^ "Scan" tool reads throttle position in volts. Voltage should increase at a steady rate as throttle is moved toward WOT.


^ An open or short to ground in CKTs 416 or 417 will result in a Code 22.

If circuit 417 is open or grounded when the vehicle engine is started a high idle may result and a scan tool may read the following.
^ TP = 0.4 volt or less.
^ RPM > 1000 in park.
^ Desired idle = 725.
^ IAC counts > 40
^ SES light "ON." Code 22 set.

If the intermittent is repaired without cycling the key "OFF" the Scan may read the following.
^ TP = 0.42 volts or less.
^ RPM > 1500 in park.
^ Desired idle = 725.
^ IAC counts > 55
^ SES light "OFF".

Check for:
^ Poor Connection or Damaged Harness. inspect PCM harness connectors for backed out terminal "C19" and/or "B4," improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection, and damaged harness.

^ Intermittent Test. If connections and harness check OK, monitor TP voltage display while moving related connectors and wiring harness. If the failure is induced, the display will change. This may help to isolate the location of the malfunction.

^ TP Scaling. Observe TP voltage display while depressing accelerator pedal with engine stopped and ignition "ON." Display should vary from closed throttle TP voltage (0.2 volts to 0.74 volts) when throttle was closed, to over 4.0 volts (4000 mV) when throttle is held at wide open throttle position. Typically, accelerator pedal travel only yields 4.0 to 4.2 volts maximum. If a TP voltage of over 4.8 volts is observed at any point in normal accelerator pedal travel, replace TP sensor.