Page 407 of 2053
1D2 -- 12 M161 ENGINE COOLING
D AEW OO M Y_2000
THERMOSTAT HOUSING ASSEMBLY
Preceding Work: Removal of viscous clutch
1a Bolt (M6 X 95, 2 pieces)
9--11 NSm (80-- 97 lb-in) .....................
1b Bolt (M8 X 75, 2 pieces)
22.5-- 27.5 NSm (16.6-- 20.3 lb-ft) .............
1c Bolt (M8 X 35, 1 piece)
22.5-- 27.5 NSm (16.6-- 20.3 lb-ft) .............
2 Thermostat Housing Assembly3O--ring
4 De-- aeration Hose
5 Coolant Outlet Hose
6 Coolant Bypass Hose
7 Tensioning Device Shock Absorber
8 Engine Hanger Brocket
Page 408 of 2053
M161 ENGINE COOLING 1D2 -- 13
D AEW OO M Y_2000
Removal & Installation Procedure
1. Drain the coolant.
2. Remove the de-- aeration hose (4), coolant outlet
hose (5) and coolant bypass hose (6).
3. Disconnect the coolant temperature sensor connec-
tor.
4. Unscrew the bolt (1c) and pry off the tensioning de-
vice shock absorber (7).
Installation Notice
Tightening Torque
22.5 -- 27.5 NSm
(16.6 -- 20.3 lb-ft)
5. Unscrow the bolts (1a, 1b) and remove the engine
hanger bracket and thermostat housing.
Installation Notice
Tightening
(1a)9--11NSm
(80 -- 97 lb-in)
Tightening
Torque(1b)22.5 -- 27.5 NSm
(16.6 -- 20.3 lb-ft)
6. Replace the O -- ring with new one.
7. Installation should follow the removal procedure in
the reverse order.
8. Check for leaks in cooling system.
Page 409 of 2053
1D2 -- 14 M161 ENGINE COOLING
D AEW OO M Y_2000
FAN SHROUD
Removal & Installation Procedure
1. Unscrew two bolts from cooling fan shroud and re-
move the shroud.
Installation Notice
Tightening Torque
3--7NSm (27 -- 62 lb-in)
2. Installation should follow the removal procedure in
the reverse order.
Page 410 of 2053
M161 ENGINE COOLING 1D2 -- 15
D AEW OO M Y_2000
REMOVAL AND INSTALLATION OF RADIATOR
Preceding Work: Removal of cooling fan shroud
1 Inlet Hose
2 Hose (to Engine)
3 Hose (to 3-- way Connector)
4 Make-- up Hose (to Coolant Reservoir)
5 3-- way Connector
6 Automatic Transmission Oil Cooling Hose
(A/T Equippend Vehicle)7 Bolt (M6 X 20, 4 pieces)
3--7 NSm (27-- 62 lb-in) .....................
8 Insulator
9 Radiator Bracket
10 Radiator
Page 411 of 2053
1D2 -- 16 M161 ENGINE COOLING
D AEW OO M Y_2000
Removal & Installation Procedure
1. Drain coolant from the radiator.
2. Remove the coolant thermo connector from the ra-
diator.
3. Remove the each coolant hoses.
4. Remove the automatic transmission fluid cooler
pipes from radiator.
Installation Notice
Tightening Torque
20 NSm (15 lb-ft)
5. Remove all the bolts (7) from the radiator bracket (9)
and remove the bracket (9) and insulator (8).
Installation Notice
Tightening Torque
3--7NSm (27 -- 62 lb-in)
6. Remove the radiator (10).
7. Check the radiator pin for crack, damage, leakage
and bending and replace it if necessary.
8. Installation is reverse order of removal.
9. Check for leakage in the cooling system.
Page 423 of 2053

D AEW OO M Y_2000
SECTION 1F2
ENGINE CONTROLS
CAUTION: Disconnect the negative battery cable before removing or installing any electrical unit or when a
tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable
will help prevent personal injury and damage to the vehicle. The ignition must also be in LOCK unless other -
wise noted.
TABLE OF CONTENTS
Engine and ECM Problem Check Report 1F2 -- 2....
Specifications 1F2 -- 3............................
Engine Data Display Table 1F2 -- 3.................
Fastener Tightening Specifications 1F2 -- 4..........
Fuel System Specification 1F2 -- 5.................
Temperature vs Resistance 1F2 -- 5................
Special Tools and Equipment 1F2 -- 6..............
Special Tools Table 1F2 -- 6.......................
Schematic and Routing Diagrams 1F2 -- 7..........
ECM Wiring Diagram
(2.3L DOHC -- MSE 3.53S) 1F2 -- 7..............
Diagnosis 1F2 -- 14................................
Failure Code Diagnosis 1F2 -- 14.....................
Clearing Failure Codes 1F2 -- 14...................
Failure Codes Table 1F2 -- 14.....................
Ignition System 1F2 -- 18...........................
Ignition Coil 1F2 -- 20.............................
Crankshaft Position (CKP) Sensor 1F2 -- 22.........
Camshaft Position (CMP) Sensor 1F2 -- 26..........
Camshaft Actuator 1F2 -- 30......................
Knock Sensor (KS) 1F2 -- 32......................
Spark Plug 1F2 -- 34.............................
System Voltage 1F2 -- 38.........................
Ignition Switch 1F2 -- 39..........................
Fuel System 1F2 -- 40..............................
Fuel Pump 1F2 -- 42.............................
Fuel Injector 1F2 -- 46............................
Purge Control Valve 1F2 -- 50.....................
Fuel Rail 1F2 -- 52...............................
Fuel Pressure Regulator 1F2 -- 54.................
Induction System 1F2 -- 56..........................
Throttle Valve Actuator 1F2 -- 56...................
Hot Film Air Mass (HFM) Sensor 1F2 -- 60..........
Engine Coolant Temperature (ECT) Sensor 1F2 -- 64.
Accelerator Pedal Module 1F2 -- 68................Cooling Fan 1F2 -- 72............................
A/C Compressor Relay 1F2 -- 73...................
Cruise Control Switch 1F2 -- 74....................
Traction Control System (TCS) 1F2 -- 75............
Stop Lamp Switch 1F2 -- 76.......................
Engine RPM 1F2 -- 77............................
Exhaust System 1F2 -- 78...........................
Catalytic Converter 1F2 -- 78......................
Oxygen Sensor 1F2 -- 80.........................
Engine Control Module 1F2 -- 86.....................
Serial Data Communication 1F2--88...............
Internal Failure 1F2 -- 90..........................
Electronic Throttle Controller Safety
Malfunction 1F2 -- 92...........................
Immobilizer 1F2 -- 94.............................
Maintenance and Repair 1F2 -- 95..................
On -- Vehicle Service 1F2 -- 95........................
Discharging the Pressure in Fuel System 1F2 -- 95...
Fuel Pump 1F2 -- 95.............................
Fuel Filter 1F2 -- 96..............................
Fuel Tank 1F2 -- 97..............................
Fuel Pressure Regulator 1F2 -- 98.................
Fuel Rail and Injector 1F2 -- 99....................
Engine Coolant Temperature Sensor 1F2 -- 100......
Throttle Body (Integrated with the
Actuator) 1F2 -- 101............................
Hot Film Air Mass (HFM) Sensor 1F2 -- 102.........
Knock Sensor 1F2 -- 102..........................
Pedal Position Sensor 1F2 -- 103...................
Oxygen Sensor 1F2 -- 103........................
Purge Control Valve 1F2 -- 104....................
Canister 1F2 -- 104...............................
Camshaft Position Sensor 1F2 -- 104...............
Crankshaft Position Sensor 1F2 -- 105..............
Engine Control Module 1F2 -- 105..................
Page 437 of 2053

M161 ENGINE CONTROLS 1F2 -- 15
D AEW OO M Y_2000
FAILURE CODES TABLE (Cont’d)
Failure
codeSee
PageDescription
401F2 -- 51Purge control valve short circuit to battery
411F2 -- 51Purge control valve short circuit to ground or open
441F2 -- 72Cooling fan (HI) relay short circuit to power
451F2 -- 72Cooling fan (HI) relay short circuit to ground or open
541F2 -- 51Purge control circuit malfunction
561F2 -- 33No.1 knock sensor signal failure
581F2 -- 27Camshaft position sensor signal : No.1 cylinder synchronization failure
591F2 -- 89CAN communication failure : MSR data transmission not plausible
601F2 -- 89CAN communication failure : ASR data transmission not plausible
641F2 -- 21No ignition voltage output (No.1 ignition coil)
651F2 -- 21No ignition voltage output (No.2 ignition coil)
671F2 -- 23Crankshaft position sensor adaptation failure
681F2 -- 35Random/Multiple Misfire
711F2 -- 39Starter signal recognition failure
721F2 -- 47No.1 injector short circuit to battery
731F2 -- 47No.1 injector short circuit to ground or open
741F2 -- 47No.2 injector short circuit to battery
751F2 -- 47No.2 injector short circuit to ground or open
761F2 -- 47No.3 injector short circuit to battery
771F2 -- 48No.3 injector short circuit to ground or open
781F2 -- 48No.4 injector short circuit to battery
791F2 -- 48No.4 injector short circuit to ground or open
801F2 -- 82Oxygen sensor high voltage
811F2 -- 83Bank 1 system short term fuel trim adaptation below lean threshold
821F2 -- 82Oxygen sensor no activity detected
831F2 -- 82Oxygen sensor not lean after overrun fuel shut -- off
841F2 -- 82Oxygen sensor slow response
851F2 -- 82Oxygen sensor heater failure
861F2 -- 82Oxygen sensor heater short circuit to battery
871F2 -- 82Oxygen sensor heater short circuit to ground or open
891F2 -- 82Oxygen sensor low voltage
931F2 -- 83Bank 1 system short term fuel trim adaptation above rich threshold
961F2 -- 83Bank 1 system short term fuel trim at rich stop
971F2 -- 83Bank 1 system short term fuel trim at lean stop
981F2 -- 83Bank 1 system idle adaptation failure (above rich threshold)
991F2 -- 83Bank 1 system idle adaptation failure (below lean threshold)
1001F2 -- 83Bank 1 system learning control failure (rich, low load)
1011F2 -- 83Bank 1 system learning control failure (lean, low load)
1021F2 -- 83Bank 1 system learning control failure (rich, high load)
Page 482 of 2053
1F2 -- 64 M161 ENGINE CONTROLS
D AEW OO M Y_2000
ENGINE COOLANT TEMPERATURE (ECT) SENSOR
YAA1F590
Engine Coolant Temperature (ECT) sensor detects coolant temperature and supplies information to the ECM. It is
composed of metal housing with two NTC resistor, 4 pin connector. The ECM provides a 5 volt signal to the ECT
sensor through a dropping resistor. When the engine is cold, the ECT sensor provides high resistance, which the ECM
detects as a high signal voltage. As the engine warms up, the sensor resistance becomes lower, and the signal voltage
drops. At normal engine operating temperature, the ECT signalwill measure about 1.5 to 2.0 volts.
The ECM uses information about coolant temperature to make the necessary calculations for:
DFuel delivery
DIgnition control
DKnock sensor system
DIdle speed
DTorque converter clutch application
DCanister purge
DCooling fan operation
DOthers