DTC 122
EAF. Code 1-2-2
1-2-2 Break in solenoid S1 circuit
DTC information
Conditions for DTC
Solenoid S1 works together with solenoid S2 and controls transmission gear-shifting. Solenoid S1 operates when battery voltage is applied from the transmission control module (TCM) and is activated in 2nd and 3rd gears. If the TCM registers a break in the solenoid S1 circuit when the solenoid should be activated DTC 1-2-2 is set. Solenoid S1 cannot then be activated.
Substitution value
Control Module GROUP I:
The TCM "Emergency mode" program has been initiated and the transmission operates only in 1st and 4th gear.
Control Module GROUP II:
The TCM "Limp-home" program in the control module has been initiated.
Defect cause
- Break in signal wiring
- Malfunction in solenoid
- Contact resistance in connections.
Fault symptom
- Poor performance due to the transmission operating in 3rd or 4th gears or operating only in 4th gear
- Rough gear shifting due to maximum system pressure in the transmission (Emergency mode)
- No Lock-up function (Emergency mode).
- Fault-tracing starts with EAF1.
EAF1
Checking Solenoid S1
- Ignition ON.
- Set gearshift selector to position R
- Check solenoid S1 using Diagnostic Test Mode 4. Use a stethoscope to hear the clicking noise made by the solenoid more clearly.
If solenoid is operating
- Intermittent fault. Fault-tracing as per EAF6.
If the solenoid is not operating:
- Checking resistance in solenoid S1 circuit EAF2.
EAF2
Checking resistance in solenoid S1 circuit
- Ignition OFF
- Connect test box and check ground points as per GB1-GB2 GB. Connecting the Test Box
- TCM disconnected.
Use a voltmeter to measure between #27 (#A27) and #20 (#A20) on the test box.
The ohmmeter should read 10-15 Ohms.
If reading is OK:
- The DTC was set because of poor contact in the TCM connector. Check the connector for loose connections as per FA5, and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections
If reading is incorrect
- Checking signal wiring as per EAF3.
EAF3
Checking signal wiring
- Ignition OFF
- Remove the air cleaner (AC) housing to access the transmission connector
- Disconnect the transmission connector.
Connect an ohmmeter between the transmission connector terminal 21 (TCM side) and #27 (#A27) on the test box.
The ohmmeter should read approx. 0 Ohms.
If reading is OK:
- Checking solenoid S1 circuit in the transmission EAF4.
If reading is incorrect:
- Check the cable between the transmission connector terminal 21 and TCM #A27 for breaks in the circuit as per FA2. FA. Checking Wiring and Connections
EAF4
Checking Solenoid S1 circuit in the transmission
- Ignition OFF
- Disconnect transmission connector.
Connect an ohmmeter between the transmission connector terminal 21 (transmission side) and the transmission housing.
The ohmmeter should read 10-15 Ohms.
If reading is OK:
- The DTC was set because of poor contact in the transmission connector Check the transmission connector and the TCM connector for loose connections as per FA5, and contact resistance and oxidation as per FA6. FA. Checking Wiring and Connections
If reading is incorrect:
- Checking resistance in solenoid S1 circuit EAF5.
EAF5
Checking resistance in solenoid S1 circuit
- Ignition OFF
- Open the control system, as per R1-R13.
- Disconnect solenoid S1.
Use an ohmmeter to measure between the pin on solenoid S1 and the transmission housing.
The ohmmeter should read 10-15 Ohms.
If reading is OK:
- Check the cable between solenoid S1 and the transmission connector terminal 21 for breaks in the circuit as per FA2. FA. Checking Wiring and Connections
If replacing cable harness, refer to R49-R57.
If reading is incorrect:
- Try a new solenoid S1 as per R20.
EAF6
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 solenoid S1 and TCM #A27 for intermittent breaks as per FA2.