Spectrum 3.0L GM - Page 207

207
DTC 522735 Oxygen Sensor Short/Open
Step Action Value(s) Yes No
1
Did you perform the On-Board (OBD) System
Check?
-
Go to Step
(2)
Go to OBD
System
Check Sec-
tion
2
 Ignition OFF
 Disconnect HEGO connector C018
 Ignition ON
 Using a DVOM check for voltage between
EGO connector pins C and D
Does the DVOM show voltage?
System Bat-
tery Voltage
Go to Step
(8)
Go To Step
(3)
3
 Ignition ON
 Using a DVOM check for voltage between
HEGO connector pin C and engine ground
Do you have voltage?
System Bat-
tery Voltage
Repair open
HEGO heater
supply circuit
from power
relay. See
wire harness
repair.
Go to Step
(4)
4
 Using a DVOM check for voltage between
HEGO connector pin D and battery positive
 Ignition ON
Do you have voltage?
System Bat-
tery Voltage
Repair open
HEGO
ground cir-
cuit. See
wire harness
repair.
Go to Step
(5)
5
 Ignition OFF
 Disconnect ECU-C Connector
 Using a DVOM check for continuity between
ECU-C connector pin L2 and HEGO connec-
tor pin D
Does the DVOM show continuity?
Go to Step
(6)
Repair the
open HEGO
heater
ground. See
wire harness
repair.
6
 Ignition ON
 Using a DVOM check for voltage between
HEGO connector pin D and battery positive
Does the DVOM show voltage?
Repair the
HEGO heater
ground short-
ed to voltage.
See wire har-
ness Repair.
Go to Step
(7)
7
 Replace ECM
Is the replacement complete?
Go to Step
(10)
-