AD25.40-W-3001A | Torque converter clutch (TCC) with control unit with diagnostic capability diagnosis operational check using actual values | 13.11.97 |
ENGINE 441.9, 445.9, 446.9 in MODEL 625.1 with CODE (G02) Torque converter clutch (TCC)
ENGINE 446.9 in MODEL 625.2 with CODE (G02) Torque converter clutch (TCC)
ENGINE 402.9, 440.9, 445.9, 446.9 in MODEL 655 with CODE (G02) Torque converter clutch (TCC)
ENGINE 440.9, 441.9, 442.9, 445.9, 446.9 in MODEL 656 with CODE (G02) Torque converter clutch (TCC)
ENGINE 442.9, 446.9 in MODEL 657 with CODE (G02) Torque converter clutch (TCC)
ENGINE 440.9, 442.9, 446.9 in MODEL 658 with CODE (G02) Torque converter clutch (TCC)
ENGINE 401.9, 440.9, 442.9, 445.9, 446.9 in MODEL 659 with CODE (G02) Torque converter clutch (TCC)
Torque converter clutch with control unit with diagnostic capability (TCC), diagnosis, basic knowledge | |||
| Torque converter clutch (TCC), location of components | ||
Diagnosis tools, TCC with control module with diagnostic capability | |||
Notes on reading out fault codes and actual values, TCC | |||
| When the retarder malfunction indicator lamp flashes, a fault in the TCC or retarder has been recognized. The fault codes and actual values can only be read out using the HHT or on vehicles with FDS/FSS. | ||
a | On-board voltage 22.5-29.5 V (acid density 1.16 kg/dm3) | ||
b | Compressed-air at least 5.5 bar | ||
c | Connect Hand-Held Tester (HHT) | ||
Function check | |||
Actual value, meaning | Operation/Requirement | Specified value | Notes |
(TCC) Actuation of torque converter lockup clutch | Ignition: ON Operate parking brake (transmission in neutral position) Engine: Start Slowly increase speed until the TCC malfunction indicator lamp goes out. Reduce speed (to approx. 950 rpm) Test kick-down switch/kick-down shift point: Operate parking brake (transmission in neutral position). Engine: Start Slowly increase speed until the TCC malfunction indicator lamp goes out. Operate kick-down switch between 1150 and 1350 rpm. | OFF ON OFF ON OFF | |
(TCC) Engine speed | Ignition: ON Engine: Start Allow engine to run at idle and engage the highest gear. |
450-550 rpm | |
(TCC) Turbine speed | Ignition: ON 1. Engine: Start Allow engine to run at idle (splitter switch switched down). 2. Switch splitter switch up and operate clutch. 3. Check torque converter lockup clutch (clutch discs, mechanical function): Operate parking brake. Engine: Start Shift transmission into 4th gear and briefly increase engine speed until throttle is wide open (observe TCC oil temperature display). 4. Check torque converter lockup clutch (clutch discs, mechanical function) on road test: Drive vehicle until torque converter lockup clutch engages (TCC malfunction indicator lamp goes out). |
XXXX rpm (is approx. engine speed) XXXX rpm (is approx. engine speed) 0 rpm XXXX rpm (is equal to engine speed) | |
(TCC) Transmission splitter switch | Ignition: ON Switch splitter switch down and operate clutch. Switch splitter switch up and operate clutch. |
OFF (low-speed splitter group) ON (high-speed splitter group) | |
(TCC) Kick-down switch | Ignition: ON Accelerator pedal not depressed. Accelerator pedal fully depressed. |
OFF ON | |
(TCC/RET) Output, retarder malfunction indicator lamp TCC/retarder fault lamp | Ignition: OFF Switch on ignition. Operate retarder stage switch stage 1-4 (engage gear do not operate accelerator pedal and clutch). |
OFF ON | |
(TCC) Brake stage switch input | Ignition: ON Retarder stage switch (accelerator pedal and clutch not operated and engage gear): switch to stage 1, switch to stage 2, switch to stage 3, switch to stage 4. | 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 | |
(RET) Proportional solenoid valve output | Ignition: ON Retarder stage switch (accelerator pedal and clutch not operated and engage gear): switch to stage 1, switch to stage 2, switch to stage 3, switch to stage 4. | 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 1 / 2 / 3 / 4 | |
(RET) Proportional solenoid valve current consumption | Ignition: ON Retarder stage switch (accelerator pedal and clutch not operated and engage gear): not operated, switch to stage 1, switch to stage 2, switch to stage 3, switch to stage 4. |
0 mA 260–290 mA/3.5 bar 320–350 mA/5.0 bar 380–410 mA/5.5 bar 440–470 mA/6.0 bar | |
(RET) ABS retarder shut-off | Ignition: ON (supply pressure > 6.5 bar) With old wiring: accelerator pedal and clutch not operated and engage gear. a) Operate accelerator pedal. b) Operate clutch c) Transmission shifted into neutral position | OFF OFF OFF (with old wiring: ON) OFF (with old wiring: ON) OFF (with old wiring: ON) | |
(RET) Clutch booster pressure switch | Ignition: ON (supply pressure > 6.5 bar) Clutch pedal not operated. Operate clutch pedal. Check throttle lock-out (with new wiring only): Operate parking brake. Engine: Start Operate clutch and then accelerator pedal. | OFF ON (with old wiring: OFF) ON, engine speed is max. idle speed + 100 rpm | |
(RET) Oil temperature | Ignition: ON Engage parking brake. Engine: Start Shift transmission into 4th gear and, if necessary, allow engine to run at increased speed (to heat up the transmission fluid) or carry out road test. | 115–175 °C | |
(RET) Load resistor/accumulator charge valve | Ignition: ON Operate stage switch stage 1 | OFF ON |