DTC 223

EAV. Code 2-2-3

2-2-3 Throttle position TP signal too low

DTC information


Conditions for DTC






The throttle position (TP) signal is passed from the TP sensor at the throttle body by the transmission control module TCM. The signal tells the TCM how far the throttle damper has opened. The TCM uses the signal in its control functions, among them controlling gear-shifting and the system pressure. The signal normally varies between approx. 0.5 and approx. 4.2 V. Opening the throttle damper increases the signal voltage. If the TCM registers a signal below approx. 0.2 V, (GROUP II control modules approx. 0.1 V), DTC 2-2-3 is set.


Substitution value

Control Module GROUP I:
The transmission control module (TCM) "Emergency mode" program has been initiated.

Control Module GROUP II:
The transmission control module (TCM) "Emergency mode I" program has been initiated.


Defect cause

- Break in signal wiring circuit
- Short circuit to ground in the signal wiring.
- Contact resistance in connections.
- Malfunction in throttle position TP sensor circuit.


Fault symptom

- Rough gear shifting due to maximum system pressure in the transmission
- No Lock-Up operational.
- Gear-shifting operation can change - irregular shifting.
- Fault-tracing starts with EAV1.



EAV1

Other DTCs.






- Read off other DTCs in the engine control module ECM (MFI Fenix 5.2, LH 3.2 or Motronic 4.3).

If DTC 2-4-3 for Fenix 5.2, 4-1-1 for LH 3.2 or 4-1-1 for Motronic 4.3 ECM has been stored:
- Fault-tracing procedures as indicated by the DTC for the ECM.






If none of the above DTCS have been stored:
- Checking throttle position TP signal EAV2.



EAV2

Checking the throttle position TP signal






- Ignition OFF
- Connect test box and check ground points as per GB1-GB2 GB. Connecting the Test Box

- TCM connected
- Ignition ON.

Use a voltmeter to measure between #50 (#B20) and #20 (#A20) on the test box.






- Depress the accelerator pedal AP and take a reading. The voltmeter should read approx. 0.5 V for closed throttle position CTP and approx. 4.2 V at wide open throttle WOT. The voltage should not be below 0.2 V (GROUP II control modules approx 0.1 V) at CTP.

If reading is OK:
- Intermittent fault. Fault-tracing as per EAV8.

If the voltmeter reads less than the values above:
- Checking voltage drop over signal ground and power ground EAV3.


EAV3

Checking voltage drop over signal ground and power ground






- Ignition ON.
- Turn on as many power consuming items as possible.

Use a voltmeter to measure between #20 (#A20) and #29 (#A29) on the test box.
The voltmeter should read less than 0.6 V.

If reading is OK:
- Checking voltage drop over signal ground EAV4.

If reading is incorrect:
- Check ground points 31/32 and 31/33, the cables between the ground points and the TCM #A20 and #A29, and the TCM connector for a break in the circuit as per FA2 and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

Then continue with: Checking voltage drop over signal ground EAV4



EAV4

Checking voltage drop over signal ground






- Ignition OFF
- Test box connected
- Connect a test box to the engine control module ECM (MFI Fenix 5.2, LH 3.2, or Motronic 4.3).
- Control modules connected
- Ignition ON.
- Turn on as many power consuming items as possible.

Use a voltmeter to measure between transmission test box #20 (#A20) and the ECM test box:

- Fenix 5.2 MFI control module: #42 (#A41), signal ground, control module
- LH 3.2 MFI control module: #20 (#A20) signal ground, control module
- Motronic 4.3 MFI control module: #42 (#A42) signal ground, control module

The voltmeter should read less than 0.1 V.






If reading is OK:
- Checking signal wiring resistance EAV5.

If reading is incorrect:
- Check ground point 31/33 wiring between the ground point and the TCM and ECM modules for contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

Then continue with: Checking signal wiring resistance EAV5.



EAV5

Checking signal wiring resistance






- Ignition OFF

NOTE: Only Motronic 4.3: Wait approx. 150 seconds.

- Disconnect the TCM and the ECM modules.

Connect an ohmmeter between transmission test box #50 (#B20) and the ECM test box:

- #20 (#B20) for Fenix 5.2 and Motronic 4.3 MFI ECM
- #50 (#B20) for LH 3.2 MFI ECM.

The ohmmeter should read approx. 0 Ohms.






If reading is OK:
-^ Check signal wiring resistance to ground EAV6.

If reading is incorrect:
- Check the cable between the TCM #B20 and the ECM #B20 for Fenix 5.2, LH 3.2 or Motronic 4.3 for break in circuit as per FA2. FA. Checking Wiring and Connections



EAV6

Checking signal wiring resistance to ground






- Ignition OFF
- Control modules disconnected

Connect an ohmmeter between transmission test box #50 (#B20) and #20 (#A20).
The ohmmeter should read infinite resistance.

If reading is OK:
- Checking signal from engine control module ECM EAV7.

If reading is incorrect:
- Check the cable between the TCM #B20 and the ECM #B20 for Fenix 5.2, LH 3.2 or Motronic 4.3 for short circuit to ground as per FA3. FA. Checking Wiring and Connections

- On cars with engine control modules ECM type LH 3.2/EZ129K, also check the cable between ECM LH 3.2 #B20 and EZ129K #B20 for short circuits to ground as per FA3. FA. Checking Wiring and Connections


EAV7

Checking signal from engine control module ECM






- Ignition OFF
- Connected test box to transmission
- Connect the control modules
- Ignition ON.

Use a voltmeter to measure between #50 (#B20) and #20 (#A20) on the test box.

- Depress the accelerator pedal AP and take a reading. The voltmeter should read approx. 0.5 V for closed throttle position CTP and approx. 4.2 V at wide open throttle WOT.

The voltage should not be below 0.2 V (GROUP II control modules approx 0.1 V) at CTP.

If reading is OK:
- The DTC was set due to poor contact in the control modules connectors or ground points 31/32 and 31/33. Check and correct the control modules' connectors for contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

If reading is incorrect:
- Check the TP sensor circuit for the ECM installed:

Fenix 5.2 DTC 2-4-3 TP signal, permanent malfunction
LH 3.2 DTC4-1-1 TP sensor signal, permanent malfunction, signal too low
Motronic 4.3 DTC 4-1-1 TP sensor signal, permanent malfunction, signal too low



EAV8

Intermittent fault

Checking wiring and connections






- Check the connectors for the transmission and the transmission control module (TCM) for loose connections as per FA5, and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections

- Check the cable between the TCM #B20 and the ECM #B20 for Fenix 5.2, LH 3.2 or Motronic 4.3 for intermittent break as per FA2, intermittent short circuit to ground as per FA3. FA. Checking Wiring and Connections

- On cars with engine control modules ECM type LH 3.2/EZ129K, also check the cable between ECM LH 3.2 #B20 and EZ129K #B20 for intermittent short circuits to ground as per FA3. FA. Checking Wiring and Connections

- Check the TP sensor circuit for the ECM installed.

Fenix 5.2 DTC 2-4-3 TP signal, permanent malfunction
LH 3.2 DTC 4-1-1 TP sensor signal, intermittent malfunction, signal too low
Motronic 4.3 DTC 4-1-1 TP sensor signal, intermittent malfunction, signal too low