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Air Intake System
The main components of the air intake system are air cleaner (1), air cleaner outlet hose (2), throttle body (3),
idle air control valve (4) and intake manifold (5).
The air (by the amount corresponding to the throttle valve (6) opening and engine speed) is filtered by the air
cleaner (1), passes through the throttle body (3), is distributed by the intake manifold (5) and finally drawn into
each combustion chamber.
When the idle air control valve (4) is opened according to the signal from ECM, the air (7) bypasses the throttle
valve (6) through bypass passage and is finally drawn into the intake manifold (5).
1. Air Cleaner 17. Knock sensor 31-2. Test switch terminal
(vehicle w/o immobilizer indicator lamp)
2. EVAP canister purge valve 18. ECT sensor 31-3. Duty output terminal
(vehicle w/o immobilizer indicator lamp)
3. IAT sensor 19. CMP sensor 32. Immobilizer indicator lamp (if equipped)
4. TP sensor 20. CKP sensor 33. Stop lamp switch
5. IAC valve 21. VSS 34. ECM
6. MAP sensor 22. A/C condenser fan (if equipped) 35. Barometric pressure sensor
(vehicle with immobilizer indicator lamp)
7. EGR valve (if equipped) 23. Malfunction indicator lamp in combination meter 36. Battery
8. EVAP canister 24. Park/Neutral position switch in TR switch (A/T) 37. Immobilizer control module (if equipped)
9. Tank pressure control valve (built-in fuel pump) 25. Ignition switch 38. ABS control module (if equipped)
10. Fuel pump 26. Starter magnetic switch 39. CO adjusting resistor (if equipped)
11. Fuel level sensor 27. TCM (A/T) 40. Power steering pressure switch
(if equipped)
12. Ignition coil assembly 28. Transmission range switch (A/T) 41. A/C compressor clutch (if equipped)
13. Fuel injector 29. DLC 42. A/C EVAP TEMP. sensor (if equipped)
14. Heated Oxygen Sensor (HO2S)-1 (if equipped) 30. Electric load 43. A/C switch (if equipped)
15. Heated Oxygen Sensor (HO2S)-2 (if equipped) 31. Monitor connector (if equipped)
16. Three way catalytic convertor (if equipped) 31-1. Diagnosis switch terminal
(vehicle w/o immobilizer indicator lamp)
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Engine & emission control input / output table
INPUTOUTPUT
ELECTRIC CONTROL DEVICE
DIAGNOSIS SWITCH TERMINAL
(VEHICLE WITHOUT IMMOBILIZER INDICATOR LAMP)
BAROMETRIC PRESSURE SENSOR
(VEHICLE WITH IMMOBILIZER INDICATOR LAMP)
STOP LAMP SWITCH
STARTER SWITCH
IGNITION SWITCH
LIGHTING SWITCH
REAR DEFOGGER SWITCH (IF EQUIPPED)
BLOWER SWITCH
A/C SWITCH (IF EQUIPPED)
A/C EVAPORATOR TEMP. SENSOR (IF EQUIPPED)
VSS
HEATED OXYGEN SENSOR-1 (IF EQUIPPED)
HEATED OXYGEN SENSOR-2
(IF EQUIPPED)For detecting deterioration of
three way catalytic converter
IAT SENSOR
ECT SENSOR
TP SENSOR
MAP SENSOR
CMP SENSOR
CKP SENSOR
TEST SWITCH TERMINAL
(VEHICLE WITHOUT IMMOBILIZER INDICATOR LAMP)
KNOCK SENSOR
FUEL PUMP RELAY
FUEL INJECTOR
HO2S HEATER
IAC VALVE
IGNITION COIL WITH IGNITER
EGR VALVE (IF EQUIPPED)
EVAP CANISTER PURGE VALVE
A/C COMPRESSOR CLUTCH
MIL
MAIN RELAY
TRANSMISSION CONTROL MODULE SIGNAL FROM SENSOR, SWITCH AND CONTROL MODULEA/C CONDENSER FAN RELAY
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1. CKP sensor 20. Power steering pressure switch
(if equipped)39. Ignition coil assembly (for No.1 and No.4 spark plugs)
2. CMP sensor 21. A/C switch 40. Ignition coil assembly (for No.2 and No.3 spark plugs)
3. VSS 22. A/C refrigerant pressure switch
(if equipped)41. Stop lamp switch
4. MAP sensor 23. Immobilizer control module (if equipped) 42. Stop lamp
5. Knock sensor 24. Data link connector 43. Lighting switch
6. TP sensor 25. Injector No.1 44. Position lamp
7. ECT sensor 26. Injector No.2 45. Rear defogger switch (if equipped)
8. IAT sensor 27. Injector No.3 46. Rear defogger (if equipped)
9. Heated oxygen sensor-1 (if equipped) 28. Injector No.4 47. A/C compressor clutch (if equipped)
10. Heated oxygen sensor-2 (if equipped) 29. IAC valve 48. Ignition switch
11. A/C evaporator temp. sensor (if equipped) 30. EVAP canister purge valve 49. Main relay
12. Speedometer 31. Fuel pump relay 50. CO adjusting register (if equipped)
13. Fuel level sensor 32. Fuel pump 51. Starting motor
14. TCM (A/T) 33. A/C condenser fan relay (if equipped) 52. 4WD controller (4WD)
15. Transmission range switch (A/T) 34. A/C condenser fan motor (if equipped) 53. ABS control module (if equipped)
16. Shift lock solenoid (A/T, if equipped) 35. EGR valve (if equipped) 54. Engine ground
17. Backup lamp 36. Malfunction indicator lamp 55. Body ground
18. Heater fan motor 37. Immobilizer indicator lamp (if equipped)
19. Heater fan switch 38. Monitor connector (vehicle without immo-
bilizer indicator lamp)
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1. CKP sensor 20. Power steering pressure switch
(if equipped)39. Ignition coil assembly (for No.1 and No.4 spark plugs)
2. CMP sensor 21. A/C switch 40. Ignition coil assembly (for No.2 and No.3 spark plugs)
3. VSS 22. A/C refrigerant pressure switch
(if equipped)41. Stop lamp switch
4. MAP sensor 23. Immobilizer control module (if equipped) 42. Stop lamp
5. Knock sensor 24. Data link connector 43. Lighting switch
6. TP sensor 25. Injector No.1 44. Position lamp
7. ECT sensor 26. Injector No.2 45. Rear defogger switch (if equipped)
8. IAT sensor 27. Injector No.3 46. Rear defogger (if equipped)
9. Heated oxygen sensor-1 (if equipped) 28. Injector No.4 47. A/C compressor clutch (if equipped)
10. Heated oxygen sensor-2 (if equipped) 29. IAC valve 48. Ignition switch
11. A/C evaporator temp. sensor (if equipped) 30. EVAP canister purge valve 49. Main relay
12. Speedometer 31. Fuel pump relay 50. CO adjusting register (if equipped)
13. Fuel level sensor 32. Fuel pump 51. Starting motor
14. TCM (A/T) 33. A/C condenser fan relay (if equipped) 52. 4WD controller (4WD)
15. Transmission range switch (A/T) 34. A/C condenser fan motor (if equipped) 53. ABS control module (if equipped)
16. Shift lock solenoid (A/T, if equipped) 35. EGR valve (if equipped) 54. Engine ground
17. Backup lamp 36. Malfunction indicator lamp 55. Body ground
18. Heater fan motor 37. Immobilizer indicator lamp (if equipped)
19. Heater fan switch 38. Monitor connector (vehicle without immo-
bilizer indicator lamp)
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ECM TERMINAL ARRANGEMENT TABLE
For TYPE A (See NOTE)
CONNEC-
TORTERMINAL WIRE COLOR CIRCUITCONNEC-
TORTERMINAL WIRE COLOR CIRCUIT
E191 B Ground for ECM
E187 W Backup power source
2 B/R Ground for drive circuit
8R/GImmobilizer indicator lamp
(if equipped)
3 B/R Ground for drive circuitDuty output terminal (vehicle without
immobilizer indicator lamp)
4 Bl/G Canister purge valve 9––
5 Bl/OrPower steering pressure switch
(if equipped)10 Bl Main relay
6 G/Y IAC valve 11 Br Tachometer
7 P/B Heater of HO2S-1 (if equipped) 12 Y/B Data link connector (5 V)
8 W/B No.4 fuel injector 13 WHeated oxygen sensor-2
(if equipped)
9 R/W No.1 fuel injector 14 W/BIDiagnosis switch terminal
(vehicle without immobilizer indicator
lamp)
10 B/Bl Ground for sensor circuit 15 PTest switch terminal
(vehicle without immobilizer indicator
lamp)
11 W CMP sensor 16 G/W A/C SW signal (if equipped)
12––17 R/Y Lighting switch
13R
R/BlHeated oxygen sensor-1
(if equipped)
CO adjusting resistor (w/o HO2S)18 P/B A/C condenser fan relay (if equipped)
14 G/B ECT sensor 19 W/G Fuel pump relay
15 Lg/B IAT sensor 20 B/Bl Ground for sensor
16 Lg TP sensor 21 B/RThrottle opening signal output for A/T
(A/T)
17 Gr/BIEGR valve (stepper motor coil 3, if
equipped)22 Y/RFuel level gauge (vehicle with immo-
bilizer indicator lamp)
18 GrEGR valve (stepper motor coil 1, if
equipped)23––
19 Br/BIG coil assembly for No.2 and 3 spark
plugs24 Bl/Y Heater blower switch
20 Br/WIG coil assembly for No.1 and 4 spark
plugs
21 R/G No.2 fuel injector
E171––
22 Lg/R Power supply for sensor 2 R R-range signal (A/T)
23 G/R CKP sensor 3––
24––4––
25 W Knock sensor 5 B/Or Overdrive cut signal (A/T)
26 G MAP sensor 6 G/Y D-range idle-up signal (A/T)
27 W/R A/C evaporator temp. sensor 7 G/W Stop lamp switch
28 Gr/BEGR valve (stepper motor coil 4, if
equipped)8––
29 Gr/REGR valve (stepper motor coil 2, if
equipped)9 B/W Ignition switch
30––10––
31 W/G No.3 fuel injector 11 Y Vehicle speed sensor
12 G ABS signal (if equipped)
E181 P A/C compressor clutch (if equipped) 13B/Y (M/T)
B/R (A/T)Engine start signal
2 V/Y Malfunction indicator lamp 14––
3 P/G Data link connector (12 V) 15––
4 R/BI Heater of HO2S-2 (if equipped) 16 R/W Rear defogger switch (if equipped)
5 Bl/B Power source 17 G/RA/T failure signal (A/T) (vehicle with
immobilizer indicator lamp)
6 Bl/B Power source
NOTE:
See NOTE in “ECM INPUT / OUTPUT CIRCUIT DIAGRAM” for applicable model.
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For TYPE B (See NOTE)
CONNEC-
TORTERMINAL WIRE COLOR CIRCUITCONNEC-
TORTERMINAL WIRE COLOR CIRCUIT
E191 B Ground for ECM
E187 W Backup power source
2 B/R Ground for drive circuit
8R/GImmobilizer indicator lamp
(if equipped)
3 B/R Ground for drive circuitDuty output terminal (vehicle without
immobilizer indicator lamp)
4 Bl/G Canister purge valve 9––
5 Bl/OrPower steering pressure switch
(if equipped)10 Bl Main relay
6 G/Y IAC valve 11 B/W Ignition switch
7 P/B Heater of HO2S-1 (if equipped) 12 R/W Rear defogger switch
8 W/B No.4 fuel injector 13––
9 R/W No.1 fuel injector 14 W/BIDiagnosis switch terminal
(vehicle without immobilizer indicator
lamp)
10 B/Bl Ground for sensor circuit 15 PTest switch terminal
(vehicle without immobilizer indicator
lamp)
11 W CMP sensor 16 G/W A/C SW signal (if equipped)
12––17 R/Y Lighting switch
13R
R/BlHeated oxygen sensor-1
(if equipped)
CO adjusting resistor (w/o HO2S)18 P/B A/C condenser fan relay (if equipped)
14 G/B ECT sensor 19 W/G Fuel pump relay
15 Lg/B IAT sensor 20B/Y (M/T)
B/R (A/T)Engine start signal
16 Lg TP sensor 21 G/W Stop lamp switch
17 Gr/BIEGR valve (stepper motor coil 3, if
equipped)22 Y Vehicle speed sensor
18 GrEGR valve (stepper motor coil 1, if
equipped)23––
19 Br/BIG coil assembly for No.2 and 3 spark
plugs24––
20 Br/WIG coil assembly for No.1 and 4 spark
plugs
21 R/G No.2 fuel injector
E171 W/R A/C evaporator temp. sensor
22 Lg/R Power supply for sensor 2 R R-range signal (A/T)
23 G/R CKP sensor 3––
24––4––
25 W Knock sensor 5 B/Or Overdrive cut signal (A/T)
26 G MAP sensor 6 G/Y D-range idle-up signal (A/T)
27––7 Y/B Data link connector
28 Gr/BEGR valve (stepper motor coil 4, if
equipped)8––
29 Gr/REGR valve (stepper motor coil 2, if
equipped)9 V/Y Malfunction indicator lamp
30––10––
31 W/G No.3 fuel injector 11 P/G Data link connector (12 V)
12 G ABS signal (if equipped)
E181 P A/C compressor clutch (if equipped) 13 Bl/Y Heater blower switch
2––14 B/Bl Ground for sensor
3––15 B/R Throttle opening sensor
4 R/BI Heater of HO2S-2 (if equipped) 16 Br Tachometer
5 Bl/B Power source 17––
6 Bl/B Power source
NOTE:
See NOTE in “ECM INPUT / OUTPUT CIRCUIT DIAGRAM” for applicable model.
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On-Vehicle Service
Accelerator cable adjustment
1) With throttle valve closed, check accelerator pedal play
which should be within following specification.
If measured value is out of specification, adjust it to specifi-
cation with cable adjusting nut (1).
Accelerator pedal play
“a” : 2 – 7 mm (0.08 – 0.27 in.)
2) With accelerator pedal depressed fully, check clearance
between throttle lever (2) and lever stopper (3) (throttle
body) which should be within following specification.
If measured value is out of specification, adjust it to specifi-
cation by changing height of pedal stopper bolt (1).
Accelerator cable adjustment clearance
(With pedal depressed fully)
“a” : 0.5 – 2.0 mm (0.02 – 0.07 in.)
Idle speed / idle air control (IAC) duty inspection
Before idle speed / IAC duty check, make sure of the following.
Lead wires and hoses of Electronic Fuel Injection and engine
emission control systems are connected securely.
Accelerator cable has some play, that is, it is not tight.
Valve lash is checked and adjusted according to mainte-
nance schedule.
Ignition timing is within specification.
All accessories (wipers, heater, lights, A/C, etc.) are out of
service.
Air cleaner has been properly installed and is in good condi-
tion.
No abnormal air inhaling from air intake system.
After above items are all confirmed, check idle speed and IAC
duty as follows.
NOTE:
Before starting engine, place transmission gear shift
lever in “Neutral” (shift selector lever to “P” range for A/T
vehicle), and set parking brake and block drive wheels.
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6) Start engine and warm it up to normal operating tempera-
ture.
7) Measure fuel pressure at idling.
If measured pressure doesn’t satisfy specification, refer to
“Diagnostic Flow Table B-3” in Section 6 and check each
possibly defective part. Replace if found defective.
8) After checking fuel pressure, remove fuel pressure gauge.
9) Remove special tools from fuel delivery pipe.
10) Connect fuel feed hose to fuel delivery pipe and clamp it
securely.
11) With engine “OFF” and ignition switch “ON”, check for fuel
leaks.
Fuel pump
ON-VEHICLE INSPECTION
1) Remove filler cap and turn ON ignition switch (2). Then fuel
pump operating sound should be heard from fuel filler (1) for
about 2 seconds and stop. Be sure to reinstall fuel filler cap
after checking.
If above check result is not satisfactory, advance to “Diag-
nostic Flow Table B-2” in Section 6.
2) Turn OFF ignition switch and leave over 10 minutes as it is.CAUTION:
As fuel feed line is still under high fuel pressure, make
sure to release fuel pressure according to following pro-
cedures.
Place fuel container under joint.
Cover joint with rag and loosen joint nut slowly to
release fuel pressure gradually.
CAUTION:
When fuel filler cap is removed in any procedure, work
must be done in a well-ventilated area, keep away from
any open flames and without smoking.
NOTE:
The fuel pressure regulator is the one body with the fuel
pump assembly so individual inspection of it is impossi-
ble.