1988 PONTIAC FIERO check engine

TROUBLESHOOTING HINTS
0 Try the following checks before doing the
System Check.
1. Check the WIPER Fuse by visual
inspection.
2. Check that the three Wiper Motor mount-
ing bolts are clean and tight.
3. Check that the Wiper/Washer Switch con-
nector C240 is correctly mated.
4. If the Washer does not operate, check that:
- Washer reservoir is filled.
- Hoses are not pinched or kinked.
- Hoses are correctly attached.
- Nozzles are not clogged.
r Go to System Check for a guide to, normal
operation.
0 Go to System Diagnosis for diagnostic tests.
SYSTEM C H EGK
Use the System Check Table as a guide to
normal operation.
Refer to System Diagnosis for a list of symp-
toms and diagnostic steps.
COMPONENT LOCATION Page-Figure
...... ..................... Fuse Block. Behind LH side of IIP, below light switch.
Washer Motor.
.................. LH side of engine compartment, in washer fluid
reservoir
................................
.......................... Wiper Motor Module ............. LH front of dash.
.. Cl00 (42 cavities) ................ LH front of dash, left of brake master cylinder
.......................... C101 (3 cavities) ................. LH front of dash.
....... C240 (7 cavities) ................. Behind IIP, near base of steering column
................... 6112 (VIN E) ................... Rear of LH cylinder head.
................... 6112 (VIN F) (VIN 8) ............. Rear of LH cylinder head.
................... 6112 (VIN S) .................... Rear of LW cylinder head.
Slll ........................... Engine harness, RH rear of engine compartment
............ S117 (VIN E) .................... Engine harness, RH front of dash.
...... S117 (VIN F) (VIN 8) ............. Engine harness, top center rear of engine.
SYSTEM CHECK TABLE Refer to System Diagnosis when a result is
not normal.
SYSTEM DIAGNOSIS
0 Do the tests listed for your symptom in the
Symptom Table below.
0 Tests follow the Symptom Table.
or two seconds
Wipers run at low
(Continued on next page)
. __- ______ --___ -..- .

WIPERIWASHER: PULSE, CD4 I G n
TROUBLESHOOTING HINTS
Try the following checks before doing the
System Diagnosis.
1. Check the Wiper Fuse by visual inspection.
2. Check that the three
VViper Motor mounting
bolts are clean and tight.
3. Check that Wipermasher Switch connector
C240 and WiperIWasher Motor Module Con-
nectors are mated correctly.
4. If the Washer does not operate, check that:
- The Washer reservoir is filled.
- The hoses are not pinched or kinked.
- The hoses are correctly attached.
- The nozzles are not clogged.
Go to System Check for a guide to normal
operation.
Go to System diagnosis for diagnostic tests.
SYSTEM CHECK
Use the System Check Table as a guide to
normal operation.
e Refer to System diagnosis for a list of symp-
toms and diagnostic steps.
COMPONENT LOCATION Page-Figure
...... ..................... Fuse Block. Behind LR side of IIP, below light switch.
.................. Washer Motor. LH side of engine compartment, in washer fluid
reservoir
................................
.......................... ............. Wiper Motor Module LN front of dash.
.. C100 (42 cavities) ................ LR front of dash, left of brake master cylinder
.......................... C101(3 cavities) ................. LH front of dash.
....... C240 (7 cavities) ................. Behind IIP, near base of steering column
................... 6112 (VIN E) ................... Rear of LN cylinder head.
................... 6112 (VIN F) (VIN 8) ............. Rear of LN cylinder head.
................... 6112 (VIN S) .................... Rear of LH cylinder head.
S111 ........................... Engine harness, RN rear of engine compartment
............ S117 (VINE) .................... Engine harness, RN front of dash.
...... S117 (VIN F) (VIN 8) ............. Engine harness, top center rear of engine.
SYSTEM CHECK TABLE
Wipers run at low speed and continue to run at
low speed until the Washer Button is released
Pulse function is overridden and the Wipers
run
After the Washer stops, the Wipers continue to
run for six seconds
I Wipers return to Pulse operation
(SYSTEM
CHECK TABLE continued on next page)

HEADLIGHTS: FOG LIGHTS
TROUBLESHOOTING HINTS
r Try the following checks before doing the
System Diagnosis
.
1 . Check that the Headlights and Park Lights
work properly before troubleshooting the
Fog Lights
.
2 . If one Fog Light doesn't work, check the
Fog Light. connections. and wires to the
Fog Light
.
Go to System Diagnosis for diagnostic tests .
SYSTEM DIAGNOSIS
Do the following test if the
operate
.
-., U .
Fog Lights do not
COMPONENT LOCATION Page-Figure
Fog Light Relay
................. LH front of engine compartment. on fender .....
Fuse Block ...................... Behind LH side of IIP. below light switch .......
Fusible Link A (VIN E) ........... Lower RN side of engine. at Starter Solenoid ....
Fusible Link A (VIN F) (VIN 8) ..... Lower RH side of engine. at Starter Solenoid ....
Fusible Link A (VIN S) ............ Lower RH side of engine. at Starter Solenoid ....
Fusible Link D .................. Front lights harness. near kH side of dash ......
Fusible Link E ................... Front lights harness. near LH side of dash ......
Fusible Link 6 .................. Front lights harness. near LN side of dash ......
......... . er Switch Behind IIP. on EN upper side
of steering column
Remote
Dimmer ................. RH side of steering column. on IIP retainer ..... .
C100 (42 cavities) ................ LH front of dash. left of brake master cylinder ..
C103 (1 cavity) ................... In front lights harness. LH rear corner of engine
compartment
............................
C213 (3 cavities) ................. Behind LH side of IIP. near Light switch ........
6103 (Except VIN E) ............. On radiator support. behind LR headlights .....
6104 .......................... On radiator support. behind RN headlights .....
6200 .......................... Behind IIP. left of steering column ............
S105 ........................... Front lights harness. behind LH headlights .....
S107 ........................... Front lights harness. behind LH headlights .....
S110 ........................... Front lights harness. behind RH headlights ....
S150 ........................... Front lights harness. behind LH headlights .....
S165 ........................... Forward lights harness. LH front corner of
engine compartment
......................
S205 ........................... I/P harness. behind instrument cluster .........
S225 ........................... I/P harness. behind instrument cluster .........
S236 ........................... IIP harness. below light switch ...............

HEADLIGHTS WITH LAMP MONITOR
TROUBLESHOOTING HINTS
r Try the following checks before doing the
System Diagnosis.
1. If the Headlight on one side is dimly lit, check
the ground on that side.
2. If the Hi Beam Indicator does not light, but
the High Beams operate, check the LT GRN
(11) wire for an open (see schematic).
3. If one Headlight doesn't work, check the con-
nections, the Headlight, and the wires to the
Headlight.
4. If the Headlights do not turn off, replace the
Light Switch.
Go to the System Diagnosis for diagnostic
tests.
SYSTEM DIAGNOSIS
0 Do the Tests listed for your Symptom in the
Symptom Table below.
@ Tests follow the Symptom Table.
SYMPTOM TABLE
I SYMPTOM I FOR DIAGNOSIS I
All Headlights
inoperative or
intermittent Do
Test A
Beam Indicator are
(Continued in next column)
COMPONENT LOCATION Page-Figure
Headlight Dimmer Switch.
........ Behind IIP, on LH upper side of steering column. 201-
9-A
Lights Monitoring Module.
........ Behind IIP, at base of steering column
.. el00 (42 cavities) ................ LH front of dash, left of brake master cylinder
201- 0-A
.... 6103 (Except VIN E) ............. On radiator support, behind LH headlights.
201-16-A
.... 6104 .......................... On radiator support, behind RH headlights.
201-16-A
............ 6200 .......................... Behind IIP, left of steering column
201-10-A
.... S107. .......................... Front lights harness, behind LH headlights.
201-16-A
.... S110. .......................... Front lights harness, behind RH headlights
201-16-A
S151. .......................... Front lights harness, lower LH side of engine
compartment
............................ 201-16-A
........ S205. .......................... IIP harness, behind instrument cluster. 201-10-A
............ S230. .......................... IIP harness, behind LH side of IIP 201-10-A
............... S231. .......................... IIP harness, above Fuse Block. 201-10-A
(Continued from previous column)
A Headlight is out,
but no warning
message is displayed
on the Instrument
Panel
A: LIGHT SWITCH TEST (TABLE 1)
At: LIGHT SWITCH CONNECTOR
(Connected)
Condition: Light Switch: HEAD
Refer to Driver
Information Center
(DIC), page 86-0
A Headlight out
warning message is
displayed but all
Headlights are
functioning properly For Diagnosis
Connect
Correct Result Of Incorrect
1 Between 1 1 Results 1
Refer to Driver
Information Center
(DIG), page 86-0
I Ground (RED) I Te;ik,",mp I see 1 I
If both results are correct, go to Test B.
1. Check Fusible Link A and RED (2) wire for
an open.
D (YEL) &
Ground Test Lamp
lights Go to able

HEADLIGHTS WlTH LAMP MONITOR: FOG LIGHTS
TROUBLESHOOTING MINTS
0 Try the following checks before doing the
System Diagnosis.
1. Check that the Headlights and Park Lights
work properly before troubleshooting the Fog
Lights.
2. If one Fog Light doesn't work, check the Fog
Light, connections, and wires to the Fog
Light.
3. If the Fog Light Switch is not illu
when the Park Lights are on, check the
GRU
(8) wire.
4.
If the FOG LIGHTS ON Light and the
Panel Light do not operate, check the BLK
(150) wire for an open.
Go to System Diagnosis for diagnostic tests.
SYSTEM DIAGNOSIS
Do the test below if the Fog Lights do not
operate.
FOG LIGHTS DO NClT OPEWTE
Measure: VOLTAGE
At: FOG
LIGHT RELAY CONNECTOR
(Disconnected)
Conditions:
r Light Switch: PARK
Fog Light Switch:
ON
Measure Correct
For Diagnosis
Belvveen
COMPONENT LOCATION Page-Figure
................. Fog Light Relay LH front
of engine compartment, on fender. .... 201-16-A
..................... Fuse Block. Behind
LH side of IIP, below light switch. ...... 201-10-A
Fusible Link A (VIN
E) ........... Lower RN side of engine, at Starter Solenoid. ... 201- 2-A
Fusible Link A (VIN F) (VIN 8)
..... Lower RH side of engine, at Starter Solenoid. ... 201- 6-B
Fusible Link A (VIN S). ........... Lower RH side of engine, at Starter Solenoid. ... 201- 1-A
.................. Fusible Link D Front lights harness, near LH side of dash. ..... 201-16-A
.................. Fusible Link E. Front lights harness, near LH side of dash. ..... 201-16-A
.................. Fusible Link G Front
lights harness, near LK side of dash. ..... 201-16-A
................. Remote Dimmer RH side of steering column, on IIP retainer ..... 201-10-A
................ el00 (42 cavities) LH front
of dash, left of brake master cylinder .. 201- 0-A
.................. 6103 (1 cavity). In
front lights harness, LH rear corner of engine
.......................... compartment.. 201-15-C
................. 6213 (3 cavities) Behind LH side
of IIP, near light switch. ....... 201-10-C
6103 (Except VIN E) ............. On radiator support, behind LK headlights. .... 201-16-A
.......................... 6104 On radiator support, behind RH headlights. .... 201-16-A
.......................... ............ 6200 Behind IIP, left of steering column 201-10-A
.......................... S105. Front lights harness, behind LH headlights. .... 201-16-A
.......................... S107. Front lights harness, behind LH headlights. .... 201-16-A
.......................... S110. Front lights harness, behind RH headlights .... 201-16-A
S165. .......................... Forward lights harness, LH front comer of
...................... engine compartment 201-15-B
.......................... S204. I/P harness, behind instrument cluster. ........ 201-10-A
.......................... S225. I/P harness, behind instrument cluster. ........ 201-10-A
.......................... ............... S236. IIP harness, below light switch 201-10-A
(BRNIWNT)
& Ground
(FOG LIGHTS DO
NOT OPERATE continued
on next page)
Battery
See
1

TROUBLESHOOTING HINTS
Try the following checks before doing the
System Diagnosis.
Turn Lights
1. Check the TURN B/U Fuse by operating the
Back Up Lights.
2. If the Turn Indicator and Front Turn Light on
one side are inoperative, check the connection
at
C210. Replace the Turn-Hazard Switch as
necessary.
3. If only some of the Turn Lights work but all of
the Hazard Lights work, replace the
Turn-
Hazard Switch.
4. If the Turn Lights stay on (do not flash) in both
Turn Left and Turn Right, replace the Turn
Flasher.
5. If only one light does not light, check the bulb,
socket, and related wiring (see schematic).
Stop Lights
1. Check the STOP-HAZFuse by operating the
Hazard Lights.
2. If no Stop Lights work, check the Brake Switch
and ORN (140) wire for continuity (see
schematic).
3. If the Stop Lights do not turn off, adjustlre-
place the Brake Switch as necessary.
4. If only one light does not light, check the bulb,
socket, and related wiring (see schematic).
Hazard Lights
1. Check the STOP-HAZ Fuse by operating the
Stop Lights.
2. If only some of the Hazard Lights work but all
of the Turn Lights work, replace the
Turn-Haz-
ard Switch.
COMPONENT LOCATION Page-Figure
................... ..... Brake Switch. Above
brake pedal, on brake pedal support 201- 9-A
.............. ........ Convenience
Center Behind IIP, to right of steering column. 201-10-A
Fuse Block.
..................... Behind LH side of IIP, below light switch. ...... 201-10-A
Turn Flasher
.................... Behind IIP, to right of steering column. ........ 201- 9-A
............. TurnlHazard Switch. Top of steering column
C100 (42 cavities) ................ LH front of dash, left of brake master cylinder .. 201- 0-A
................. ................. C208 (8 cavities) Behind LH side of rear seat. 201-17-C
C210
(11 cavities) ................ Behind IIP, on RN lower side of steering column. 201- 9-A
................. .................... 6312 (2 cavities) Behind rear license plate 201-17-A
............. ..... 6103 (Except VIN E) On radiator support, behind LN headlights 201-16-A
.......................... .... 6104
On radiator support, behind RH headlights. 201-16-A
.......................... ............ 6200 Behind IIP, left of steering column 201-10-A
........................ .......................... 6303 Center of end panel. 201-17-B
.......................... .... S105. Front lights harness, behind LH headlights. 201-16-A
.......................... S106. Front lights harness, LN front corner of engine
compartment..
.......................... 201-1543
.......................... .... S107. Front lights harness, behind LH headlights. 201-16-A
.......................... ..... S109. Front lights harness, left of RH headlights 201-16-A
S110. .......................... Front lights harness, behind RH headlights .... 201-16-A
S205. .......................... IIP harness, behind instrument cluster. ........ 201-10-A
S225. .......................... IIP harness, behind instrument cluster. ........ 201-10-A
S226. .......................... IIP harness, at head of console. ............... 201-10-A
S227. .......................... IIP harness, behind instrument cluster. ........ 201-10-A
S302. .......................... Rear lights harness, LW side of end panel. ...... 201-17-B
.......................... S307. Rear lights harness, LH rear corner of cargo
compartment..
.......................... 201-17-B
.......................... ..... S308. Rear lights harness, behind LH rear lights. 201-17-A
S311. .......................... Rear lights harness, left of RH backup lights ... 201-17-A
3. If the Hazard Lights do not turn off, replace the
4. If the Hazard Lights stay on (do not flash),
Turn-Hazard Switch.
replace the Hazard Flasher.
(Continued on next page)

EXTERIOR LIGHTS WITH LAMP MONITOR I:
TROUBLESHOOTING HINTS
r Try the follovving checks before doing the
Systern Diagnosis .
1 . If neither the Turn Lights nor the Back Up
Lights work. check the TURN
BIU Fuse .
2 . If neither the Stop Lights nor the Hazard
Lights work. check the STOP-HAZ Fuse
.
3 . If only one light does not operate. check bulb.
socket. and related wiring (see schematic)
.
4 . If one of the Turn Indicators goes on when the
Park Lights are turned on. check the Front
Turn Light on that side
.
5 . For any of the following symptoms. replace the
Turn-Hazard Switch:
Some Turn Lights work and all Hazard
Lights work
.
@ Some Hazard Lights work and all Turn
Lights work
.
Hazard Lights do not turn off .
6 . If the Turn Lights stay on (do not flash) in both
TURN LEFT and TURN RIGHT. replace the
Turn Flasher
.
7 . If the Hazard Lights stay on (do not flash) in
HAZARD. but the Stop Lights go off normally.
replace the Hazard Flasher
.
8 . If no Park. Tail. or License Lights work.
check the Light Switch. and the
ORNIBLK
(240) and BRN (9) wires for an open (see
schematic)
.
COMPONENT LOCATION Page-Figure
..... Brake Switch .................... Above brake pedal. on brake pedal support 201- 9-A
......... Convenience
Center .............. Behind IIP. to right of steering column 201-10-A
....... Fuse
Block ...................... Behind LH side of IIP. below light switch 201-10-A
Lights Monitoring Module
......... Behind IIP. at base of steering column
......... Turn Flasher .................... Behind IIP. to right of steering column 201-
9-A
TurnIHazard Switch .............. Top of steering column
.. ClOO (42 cavities) ................ LW front of dash. left of brake master cylinder 201- 0-A
................. C105 (2 cavities) Behind
LH side of IIP. near fuse block
.................. 6205 (3 cavities) ................. Behind LH side of rear seat 201-17-6
.................. ................. C208 (8 cavities) Behind LR side of rear seat 201-17-C
. C210 (11 cavities) ................ Behind IIP. on RH lower side of steering column 201-
9-A
.................... C312 (2 cavities) ................. Behind rear license plate 201-17-A
..... ............. 6103
(Except VIN E) On
radiator support. behind LH headlights 201-16-A
..... .......................... 6104 On
radiator support. behind RH headlights 201-16-A
............ .......................... 6200 Behind IIP. left of steering column 201-10-A
......................... .......................... 6303 Center of end panel 201-17-B
..... ........................... S105 Front lights harness. behind LH headlights 201-16-A
S106
........................... Front lights harness. LH front corner of engine
............................ compartment 201-15-B
..... ........................... S107 Front lights harness. behind LH headlights 201-16-A
..... S109 ........................... Front lights harness. left of RH headlights 201-16-A
.... S110 ........................... Front lights
harness. behind RH headlights 201-16-A
......... S205 ........................... IIP harness. behind
instrument cluster 201-10-A
......... S225 ........................... I/P harness. behind instrument cluster 201-10-A
......... S227 ........................... IIP harness. behind instrument cluster 201-10-A
....... S302 ........................... Rear lights harness. LH side of end panel 201-17-B
S307
........................... Rear lights harness. LH rear corner of cargo
............................ compartment 201-17-B
...... S308 ........................... Rear lights harness. behind LH rear lights 201-17-A
S311
........................... Rear lights harness. left of RW back up lights ... 201-17-A

THEFT DETERRENT SYSTEM: PASSKEY I a
TROUBLESHOOTING HINTS COMPONENT LOCATION
Try the following checks before doing the Sys-
tem Check.
1. Check the key pellet sensing contacts in the
Ignition Lock Cylinder by looking into the
key opening. If the contacts are damaged,
replace the Lock Cylinder.
2. Check the VATS Fuse by visual inspection.
3. Check owner's ignition key using the 535628
VATS Interrogator or equivalent.
If the Key
Code window shows "E", replace the
owner's key.
4. Check the Security Indicator Bulb.
5. Check the
CIH Fuse by visual inspection.
Go to System Check for a guide to normal
operation.
Go to System Diagnosis for diagnostic tests.
SYSTEM CHECK
Use the System Check Table as a guide to
normal operation.
r Refer to System Diagnosis for a list of symp-
toms and diagnostic steps.
Clutch Start Switch .............. Above clutch pedal, on clutch pedal support
Convenience Center
.............. Behind IIP, to right of steering column. ........
Electronic Control Module (ECM) ... Behind RN side of IIP ......................
Fuse Block. ..................... Behind LH side of IIP, below light switch. ......
Gear Selector Switch ............. In console, at base of gear selector ............
Ignition Switch. ................. Behind IIP, on top side of steering column ......
Starter Enable Relay ............. Behind LH side of IIP, left of steering column
Starter Solenoid (VIN E)
.......... Lower RH side of engine ....................
Starter Solenoid (VIN F) (VIN 8). ... Lower RH side of engine ....................
Starter Solenoid (VIN S) .......... Lower RN side of engine ....................
VATS Decoder Module. ........... Behind LH side of IIP, above steering column
Cl00 (42 cavities) ................ LH front of dash, left of brake master cylinder ..
C207 (15 cavities) ................ Behind RN side of IIP, near ECM .............
6228. .......................... Behind IIP, on upper RH side of steering column
6118 (VIN
E) ................... Rear of RN cylinder head. ...................
6118 (VIN F) (VIN 8) ............. Rear of RH cylinder head. ...................
6118 (VIN S) .................... Rear of RN cylinder head. ...................
S143 (VIN E) .................... Engine harness, RR front of dash. ............
S143 (VIN F) (VIN 8) ............. Engine harness, RN front of dash. ............
S143 (VIN S) .................... Engine harness, center front of dash. ..........
S217. .......................... IIP harness, behind center of IIP. .............
S224. .......................... IIP harness, near LH shroud
S234. .......................... I/P harness, above Fuse Block. ...............
S242. .......................... IIP harness, behind RH side of IIP ............
SYSTEM CHECK TABLE
(Continued on next page)
Put
the Ignition
Switch in RUN
R aJ XI
Page-Figure u
Security Indicator
lights for
approximately 2
seconds If Indicator does not
light do Test E