The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0134: Right Primary Heated Oxygen Sensor
(Right Primary HO2S) (Bank 1, Sensor 1) heater system malfunction.
The HDS or the scan tool indicates Diagnostic Trouble Code (DTC) P0154: Left Primary Heated Oxygen Sensor
(Left Primary H02S) (Bank 2, Sensor 1) heater system malfunction.
The MIL has been reported on.
DTC P0134 and/or P0154 are
stored.
Problem verification:
1. Do the PCM Reset Procedure.
2. Start the engine. Hold the
engine at 3,000 rpm with no
load (in Park or neutral) until
the
radiator
fan
comes
on.
Is DTC P0134 and/or P0154
indicated?
YES
Check for an open in the HO2S:
1. Turn the ignition switch OFF.
2.
Disconnect
the
right primary
H02S (Bank 1, Sensor 1) or left
primary HO2S* (Bank2, Sen-
sor 1) connector.
3. Install a jumper wire on the
harness side of the right prima-
ry H02S (Bank 1,Sensor 1) or
left primary H02S*connector
between terminals No. 1 and
No. 2.
4. Turn the ignition switch ON (II).
5. Check the right primary HO2S
(Bank 1, Sensor 1) or left pri-
mary HO2S*(Bank2, Sensorl)
output voltage with the HDS
or the scan tool.
Is there 1.5 V or more?
YES
Check for an open in the wires
(PHO2S line):
1. Turn the ignition switch OFF.
2. Install a jumper wire on the
PCM connector between D19,
orD18*andD22.
3. Turn the ignition switch ON (II).
4. Check the right primary H02S
(Bank 1, Sensor 1) or left pri-
mary H02S* (Bank 2, Sensor 1)
output voltage with the HDS
or the scan tool.
Is there 1.5 V or more?
YES
NO
Intermittent failure, system is OK
at this time. Check for poor con-
nections or loose terminals at
C251, C254 (located at right shock
tower), C119 (right primary H02S
(Bank 1, Sensor 1)) or C126 (left
primary H02S (Bank 2, Sensor 1))*
and
PCM.
Replace the HO2S.
Repair open in the wire between
PCM (019 or D18*) and right pri-
mary HO2S (Bank 1, Sensor 1) or
left primary HO2S* (Bank 2,
Sensor 1).
Substitute a known-good PCM and
recheck. If symptom/indication
goes away, replace the original
PCM.ProCarManuals.com
Fuel Suppl y Syste m
Fuel Gaug e (cont'd )
6. Tur n th e ignitio n switc h OFF .
7 . Attac h a jumpe r wir e betwee n th e No . 1 an d No . 2
terminals , the n tur n th e ignitio n switc h O N (II) .
8 . Chec k tha t th e pointe r o f th e fue l gaug e start s mov -
ing towar d th e "F " mark .
CAUTION : Tur n th e ignitio n switc h OF F befor e th e
pointe r reache s "F " o n th e gaug e dial . Failur e to d o
s o ma y damag e th e fue l gauge .
NOTE : Th e fue l gaug e is a bobbi n (cross-coil )
type,
henc e th e fue l leve l i s continuousl y indicate d eve n
whe n th e ignitio n switc h i s OFF , an d th e pointe r
moves mor e slowl y tha n tha t o f a bimeta l type .
• I f th e pointe r o f th e fue l gaug e doe s no t mov e a t
all , replac e th e gauge .
• I f th e gaug e i s OK , inspec t th e fue l gaug e send -
ing unit .
ProCarManuals.com
