Page 449 of 4770

(1) Remove glove compartment
(See page BO±114).
(2) Disconnect A/C amplifier connector.
(3) Turn ignition switch on.
Measure voltage between terminal AC2 of A/C
amplifier connector and body ground.(1) Disconnect throttle position sensor connec±
tor.
(2) Disconnect the vacuum hose from the throt±
tle body, then apply vacuum to the throttle
opener (See page EG1±204).
Measure resistance between terminals 2 (IDL)
and 1(E2) of throttle position sensor connector.
Check for open and short in harness and connector between
engine control module and A/C amplifier (See page IN±31). Disconnect A/C amplifier connector, check voltage between
terminal AC2 of A/C amplifier connector and body ground.
Check and repair harness or connector between
engine control module and throttle position sensor.Adjust or replace throttle position sensor
(See page EG1±209).
Check resistance of throttle position sensor.
Check and replace engine control module.Repair or replace harness or connector. Check and replace A/C amplifier.
1 M or higher Less than 2.3 k Throttle Valve
Fully closed
Resistance
Opened
Voltage: 9 ±14 V
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±399
Page 450 of 4770

CIRCUIT DESCRIPTION
The Park/Neutral position switch goes on when the shift lever is in the N or P shift position. When
it goes on the terminal NSW of the ECM is grounded to body ground via the starter relay and theft
deterrent ECU, thus the terminal NSW voltage becomes 0V. When the shift lever is in the D, 2, L or
R position, the Park/Neutral position switch goes off, so the voltage of ECM terminal NSW becomes
battery voltage, the voltage of the ECM internal power source. If the shift lever is moved from the N posi-
tion to the D position, this signal is used for air±fuel ratio correction and for idle speed control (estimated
control), etc. When the Park/Neutral position switch is off, code ª51º is output in the test mode diagnosis.
(This is not abnormal.)
Park Neutral Position Switch Circuit (Only vehicles with
A±T)
Check for open in harness and connector
between park/neutral position switch and ECM.Check output condition of diagnostic trouble
code 51.
Proceed to next circuit inspection shown
on matrix chart (See age EG1±327).
Check park/neutral position switch.
(See page AX1±92) Repair or replace harness or connector.
Replace park/neutral position switch.Check and replace ECM.
Check and replace ECM.
N G Type II NGType I
DIAGNOSTIC CHART
HINT: This diagnosis chart is based on premise that the engine is cranked normally. If the engine
is not cranked, proceed to the matrix chart of problem symptoms on page EG1±327.
± 5S±FE ENGINEFE ENGINE TROUBLESHOOTING ± CIRCUITINSPECTION
EG1±400
Page 451 of 4770
WIRING DIAGRAM
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±401
Page 452 of 4770
(1) Connect terminals TE2 and E1 of DLC2.
(2) Turn ignition switch on.
(3) Crank the engine.
(4) Connect terminals TE1 and E1 of DLC2.
Check if diagnostic trouble code ª51º is output
when the shift lever is in the P and D shift positions.
Check for open in harness and connector between engine control
module and park/neutral position switch (See page
IN±31).
Check park/neutral position switch (See page
AX1±92). Check output condition of diagnostic trouble code 51.
Proceed to next circuit inspection shown on
matrix chart (See age EG1±327).
Replace park/neutral position switch.Check and replace engine control module.
Check and replace engine control module.Repair or replace harness or connector.
INSPECTION PROCEDURE
NG
Type II NG
Type I
Shift
Position
Go to stepGo to step
Normal Code
Normal Code Normal CodeNG Type
IIN G Type I
Code 51Code 51
Code 51Result
ºDºªPº
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±402
Page 453 of 4770

CIRCUIT DESCRIPTION
When the ignition switch is turned on, battery positive voltage is applied to the coil, closing the
contacts of the EFI main relay and supplying power to the terminals + B and + 131 of the ECM.
Check for open in harness and connector
between IG switch and EFI main relay, EFI main
relay and body ground.
Check for open in harness and connector
between EFI main relay and battery, EFI main
relay and ECM.Check continuity between terminal E1 and
body ground.Proceed to next circuit inspection shown
on matrix chart (See page EG1±327).
Check for short in all the harness and
components connected to IGN fuse.
Check for short in all the harness and
components connected to EFI fuse.
ECM Power Source Circuit
Repair or replace harness or connector.
Repair or replace harness or connector. Check voltage of ECM power source.
DIAGNOSTIC CHART
Replace ignition switch.
Check EFI fuse.Replace EFI main relay.
Check ignition switch.Check EFI main relay.
Check IGN fuse.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±403
Page 454 of 4770
WIRING DIAGRAM
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±404
Page 455 of 4770
(1) Remove glove compartment.
(See page EG1±234)
(2) Turn ignition switch ON.
Measure voltage between terminals + B, + 131
and E1 of engine control module connector.
Voltage: 9 ±14 V
Check for open in harness and connector between terminal E1 of
engine control module and body ground (See page IN±31). Check voltage between terminals + B, + 131 and E1 of engine control
module connector.
Proceed to next circuit inspection shown on
matrix chart (See page EG1±327).
Repair or replace harness or connector.
INSPECTION PROCEDURE
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±405
Page 456 of 4770
Remove EFI main relay from J/B No±2.
Check continuity between terminals of EFI main
relay shown below.
Remove IGN fuse from J/B No.1.
Check continuity of IGN fuse.(1) Apply battery voltage between terminals 1
and 2.
(2) Check continuity between terminals 3 and 5.
Check for short in all the harness and
components connected to IGN fuse (See
attached wiring diagram).
Check EFI main relay.
Continuity
(Reference value 72)
Replace EFI main relay.
Check IGN fuse.
Terminals 3 and 5
Terminals 1 and 2
Terminals 3 and 5 ContinuityOpen
Continuity
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±406