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  #11  
Old 10-13-2009, 09:18 PM
tech's Avatar
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If a cat was bad it usually falls to pieces and cause rattles.
You can test the O2 sensor if you use an OBDII scanner and read real time.
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  #12  
Old 10-14-2009, 05:13 AM
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Reading real-time method is definitely more simple than this:

Code 1-5-3 (Rear HO2S Signal)
1) If Codes 5-2-2 or 2-1-2 are stored, perform diagnosis for
these codes first. If fault is permanent or intermittent and signal is
too high, perform diagnosis as per Code2-1-2. If fault is permanent
and signal is too low, go to next step. If fault is permanent and
signal is faulty, go to step 8). If fault is intermittent and signal
is too low, go to step 9). If fault is intermittent and signal is
faulty, go to step 10).

2) Turn ignition off. Wait 2 minutes. Disconnect rear HO2S
Gray connector. Connect an ohmmeter between HO2S connector terminal
No. 4 and ground. If ohmmeter shows about 100 k/ohms, go to step 4).
If ohmmeter shows infinite resistance, go to next step. If ohmmeter
shows about zero ohms, check wiring between rear HO2S connector
terminal No. 4 and ECM terminal A34 for a short circuit to ground.

3) Turn ignition off. Disconnect HO2S connector. Ensure ECM
connector terminal contacts are clean and tight. Reconnect ECM.
Connect an ohmmeter between HO2S connector terminal No. 4 and ground. If ohmmeter reads about 100 k/ohms, source of code is poor contact at
ECM connector. If ohmmeter does not read about 100 k/ohms, check
wiring between rear HO2S connector terminal No. 4 and ECM terminal A34
for an open circuit.

4) Turn ignition off. Disconnect rear HO2S connector. Connect
an ohmmeter between HO2S connector terminal No. 3 and ground. If
ohmmeter reads about 200 ohms, go to step 7). If ohmmeter shows
infinite resistance, go to next step. If ohmmeter shows about zero
ohms, go to step 6).

5) Turn ignition off. Disconnect rear HO2S connector. Ensure
ECM connector terminals are clean and tight. Reconnect ECM. Connect an
ohmmeter between HO2S connector terminal No. 3 and ground. If ohmmeter reads about 200 ohms, source of code is poor contact in ECM connector.
If ohmmeter does not read about 200 ohms, check wiring between rear
HO2S connector terminal No. 3 and ECM terminal A19 for an open
circuit.

6) Turn ignition off. Disconnect rear HO2S connector.
Disconnect front HO2S Black connector. Connect an ohmmeter between
rear HO2S connector terminal No. 3 and ground. If ohmmeter reads about
200 ohms, test system using a new front HO2S. If ohmmeter does not
read about 200 ohms, check wiring between front HO2S connector
terminal No. 3 and ECM terminal A33, and wiring between rear HO2S
connector terminal No. 3 and ECM terminal A19 for a short to ground.

7) Turn ignition off. Ensure rear HO2S is connected. Start
and run engine at idle. Check voltage at rear HO2S. Voltage signal
should have left its bottom setting (-.165 volt) and stabilized
between .1-.9 volt within about 10 minutes. If reading is okay, source
of code is poor contact at rear HO2S connector. If reading is not
okay, retest using new rear HO2S.

8) If fault is permanent and signal is faulty, turn ignition
off. Wait about 2 minutes. Disconnect rear HO2S Gray connector.
Connect an ohmmeter between HO2S connector terminals No. 3 and 4. If
ohmmeter reads infinite resistance, check wiring between rear HO2S
connector terminal No. 4 and ECM connector terminal A34 for a short
circuit to rear HO2S connector terminal No. 3 and ECM connector
terminal A19. If ohmmeter does not read infinite resistance, test
using new HO2S.

9) If fault is intermittent and signal is too low, check
wiring between rear HO2S connector terminal No. 4 and ECM terminal
A34, and between rear HO2S connector terminal No. 3 and ECM terminal
A19 for an open circuit. Check ECM and rear HO2S connector for loose
connection. Check wiring between rear HO2S connector terminal No. 4
and ECM terminal A34 for an intermittent short circuit to ground. Also
check wiring between front HO2S connector terminal No. 3 and ECM
terminal A33, and wiring between rear HO2S connector terminal No. 3
and ECM terminal A19 for an intermittent short circuit to ground.
10) If fault is intermittent and signal is faulty, check
wiring between rear HO2S connector terminal No. 4 and ECM connector
terminal A34 for an intermittent short circuit of wire between


Code 5-2-1 (Front HO2S Preheating) Or Code 5-2-2 (Rear HO2S Preheating)
1) Check status message using Volvo Scan Tool (998-8686). If
PERMANENT FAULT, SIGNAL TOO HIGH is displayed, go to next step. If
PERMANENT FAULT, SIGNAL TOO LOW is displayed, go to step 3). If
INTERMITTENT FAULT, SIGNAL TOO HIGH is displayed, go to step 8). If
INTERMITTENT FAULT, SIGNAL TOO LOW is displayed, go to step 9).

2) If PERMANENT FAULT, SIGNAL TOO HIGH is displayed, turn
ignition off. Disconnect front HO2S Black connector and/or rear HO2S
Gray connector. Turn ignition on. Connect voltmeter between HO2S
connector terminal No. 2 and ground. If voltmeter reads about zero
volts, retest using new HO2S. If voltmeter does not read about zero
volts, check wiring between HO2S connector terminal No. 2 and ECM
terminal A14 (Code 5-2-1) or terminal A29 (Code 5-2-2) for signs of a
short circuit to voltage.

3) If PERMANENT FAULT, SIGNAL TOO LOW is displayed, turn
ignition off. Disconnect front HO2S Black connector and/or rear HO2S
Gray connector. Turn ignition on. Connect voltmeter between HO2S
connector terminal No. 1 and ground. If voltmeter reads battery
voltage, go to next step. If voltmeter does not read battery voltage,
check wiring between HO2S connector terminal No. 1 and main relay
connector terminal No. 3 for an open circuit.

4) Turn ignition on. Disconnect HO2S connector. Connect
voltmeter between HO2S connector terminal No. 2 and ground. If
voltmeter reads about zero volts, go to next step. If voltmeter does
not read about zero volts, check wiring between HO2S connector
terminal No. 2 and ECM terminal A14 (Code 5-2-1) or terminal A29 (Code
5-2-2) for a short circuit to voltage.

5) Turn ignition off. Wait about 2 minutes. Disconnect HO2S
connector. Disconnect ECM. Connect ohmmeter between HO2S connector
terminal No. 2 and ground. If ohmmeter reads infinite resistance, go
to next step. If ohmmeter does not read infinite resistance, check
wiring between HO2S connector terminal No. 2 and ECM terminal A14
(Code 5-2-1) or terminal A29 (Code 5-2-2) for a short circuit to
ground.

6) Turn ignition off. Disconnect HO2S and ECM connectors.
Connect Breakout Box (981-3190) to ECM connector. Check all grounds.
See COMPUTERIZED ENGINE CONTROLS in I - SYSTEM/COMPONENT TESTS
article. Connect an ohmmeter between HO2S connector terminal No. 2 and
breakout box pin No. 14 (Code 5-2-1) or pin No. 29 (Code 5-2-2). If
ohmmeter reads about zero ohms, go to next step. If ohmmeter does not
read about zero ohms, check wiring between HO2S connector terminal No.
2 and ECM terminal A14 (Code 5-2-1) or terminal A29 (Code 5-2-2) for
an open circuit.

7) Turn ignition off. Reconnect HO2S connector. Disconnect
ECM connector. Connect ohmmeter between breakout box pins No. 27 and
No. 14 (Code 5-2-1) or No. 29 (Code 5-2-2). If ohmmeter reads 1.5-13
ohms, code is caused by poor contact in ECM and/or HO2S connector. If
ohmmeter does not read 1.5-13 ohms, retest using new HO2S.

8) If INTERMITTENT FAULT, SIGNAL TOO HIGH is displayed, check
wiring between HO2S connector terminal No. 2 and ECM terminal A14
(Code 5-2-1) or terminal A29 (Code 5-2-2) for an intermittent short
circuit to voltage.

9) If INTERMITTENT FAULT, SIGNAL TOO LOW is displayed, check
wiring between HO2S connector terminal No. 1 and main relay connector
terminal No. 3 for an intermittent open circuit. Check wiring between
HO2S connector terminal No. 2 and ECM terminal A14 (Code 5-2-1) or
terminal A29 (Code 5-2-2) for an intermittent open circuit or short
circuit to ground. Also check HO2S and ECM connectors for loose
connection, contact resistance, and oxidation.


.....OK, where's my eye-drop.....


JPN
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  #13  
Old 10-14-2009, 06:47 AM
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Holy descriptive. When I have a little bit more time, I'm going to read that whole thing, but just buy the length of it and use of larger words, I can already tell it's going to be good.

haha
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  #14  
Old 10-14-2009, 10:50 AM
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I reset the code last night and have driven the car 3 times for a total of 40 miles. No CEL yet.

Last time I cleared the code, the CEL light did not come on for about 100 miles. Two days later. I guess I can hook up my code reader and try to read it real time.
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  #15  
Old 10-15-2009, 07:53 AM
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Well, another day has passed and no code. It's been about 185 miles since I reset the light.
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'95 850 T-5R Wagon - Panther - Daily Driver 22 / 28 mpg
'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
--------------------------------------------
Volvo Repair Videos - Used Parts For Sale - Interior Lights For Sale - ABS Light? Click Here - Men's Mentoring
--------------------------------------------
Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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  #16  
Old 10-19-2009, 07:01 PM
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The CEL came back on about 2 hours after I left my last post. Turns out that I can reset the light and check it with the OBD-II code reader and a trouble code can be read almost immediately but it takes a day or so before the CEL comes back on.

I preformed a live reading and here is what I have:
Fuel System 1: Closed Loop, Fault
Fuel System 2: N/A
Load Value: 12.4%
Coolant Temp: 179 F
STFT - Bank 1: -4.6%
LTFT - Bank 1: -3.1%
Engine RPM: 2320 RPM
Vehicle Speed: 66 MPH
Ignition Advance: 27.0 deg
MAF Air Flow Rate: 3.0 lb/min
Throttle Position: 15.2%
Bank1 - Sensor 1: 02S Output 0.990V
Bank1 - Sensor 1: STFT 1.5%

Not sure what all that means but I know I have a fuel system closed loop fault.

I guess I will change my rear O2 sensor and see what happens from there.
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'95 850 T-5R Wagon - Panther - Daily Driver 22 / 28 mpg
'98 S70 GLT - Lil' Red - Daughter 22/30 mpg
--------------------------------------------
Volvo Repair Videos - Used Parts For Sale - Interior Lights For Sale - ABS Light? Click Here - Men's Mentoring
--------------------------------------------
Volvo's of time past: '87 740 GLE, '79 262C Bertone, '78 264, '95 960, '97 960, '98 S90, '98 S70 GLT, '95 850 T-5R Yellow, '95 960, ,96 850 R...
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Old 10-19-2009, 07:01 PM
 
 
 
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