Is there any place online where I can get a step by step procedure to
display these codes and interpret what they mean?
I'm looking for something to tell if the crank position sensor and
possibly fuel pump pressure are good.
Electronic Transmission (Socket A 1)
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111 No faults found
112 Solenoid S1 short circuit to battery voltage
113 Transmission control module (TCM) fault
114 Program selector open circuit or short circuit to supply
121 Solenoid S1 short circuit to ground or control module fault
122 Solenoid S1 open circuit
123 Solenoid STH short circuit to battery voltage
124 Mode selector faulty or short circuit to ground
131 Solenoid STH open/short circuit or control module fault
132 Transmission control module(TCM) fault
134 Faulty load signal from ignition control module
141 Oil temperature sensor short circuit to ground
142 Oil temperature sensor open circuit
143 Kickdown switch faulty or short to ground
211 Transmission control module (TCM) fault
212 S2 solenoid short circuit to battery
213 Throttle position (TPS) signal too high
221 S2 solenoid short circuit to ground or control module fault
222 S2 solenoid open circuit
223 Throttle position (TPS) sensor signal too low
231 Throttle position (TPS) sensor sporadic
232 Speedometer signal missing
233 Incorrect speedometer signal
235 High Oil temperature
245 Open or short in Torque limiting circuit
311 RPM signal from transmission missing
312 RPM signal from transmission faulty
313 Faulty signal from gear position sensor (PNP)
321 Shift time too long
322 Incorrect gear ratio
323 Lock up slips or is not engaged
331 Short circuit to battery in SL circuit
332 SL solenoid open or control module fault
333 SL solenoid short or control module fault
A2 DTC Codes
DTC: ECT-123 Diagnostic Socket A2
Engine Coolant Temperature Sensor Code
The diagnostic trouble code EFI-123 is stored in the Engine
Control Unit (ECU). The code, if set will be in diagnostic socket A2.
A code will be set if the signal received at the ECU is below -44 C or
above 148 C. When the engine is started a theoretical temperature is
assumed and once that temperature reaches 75 C it is compared to the
actual reading from the ECT. If the ECT temperature is lower than 58 C
the code will be set. Should the code be set idle air trim adaptation
is disabled, long-term fuel trim is disabled, leakage diagnostics is
disabled and initial boost pressure is adopted. Replacement of the
sensor can be done by following the instructions for replacing the
thermostat. If you haven't replaced your thermostat in 60K or notice
that it takes a while for the temp gauge to get to the 3:00 position,
you might want to replace it while you are doing the ECT sensor.
Oxygen Sensor Codes Diagnostic socket A2:
EFI-153,212,425,435,436,521,533
When any of the Oxygen Sensor codes are set, the most common
repair is to replace the faulty sensor, however don't over look
possible causes for the sensor to have failed such as: intake leak,
exhaust leak, faulty spark plugs or wires, low compression on one or
more cylinders, bad gas, or failed catalytic converter. Normally when
an O2 sensor code has been set, fuel trim is inhibited and possible
three-way catalytic converter (TWC) damage may occur. It is always a
good idea to first read the codes and then see if they return prior to
replacing any sensor, however if you have access to a scan tool, the
tool can tell you how many times the code has been set, and if it's
more than once or twice, you can be sure it is not a glitch in the
system and a repair is in order. The oxygen sensor used in the Volvo
FWD 850 is a 4-wire Bosch sensor, some owners have had success at
replacing the sensor with an after market (Bosch) sensor. The sensor
must be soldered into the existing wiring harness, if your not handy
with a soldering iron then by the Volvo replacement. Instructions for
replacing the sensors can be found in the repair section of this site
at bay13.
EFI-153; In order for the rear sensor to be able to monitor
the three way catalytic converter and affect fuel trim, it must be at
operating temperature and at the correct output voltage. Monitoring
begins 3 minutes after start of the preheating. If the output voltage
is different than the permitted values the code 153, Rear HO2 sensor
signal missing or faulty is set.
EFI-212; After 3 minutes of monitoring if the front sensor
deviates from the permitted values, code 212, front HO2S signal
missing or faulty is set.
EFI-425; the rear sensor ensures the front is adjusting
integrator values correctly, if all positive or negative, the rear
sensor can be used to fine-tune the front sensors inputs. Tuning in
only one direction by the rear sensor will set code 425, rear HO2
sensor control faulty.
EFI-435; the ECM clocks the time for the sensor to sweep from
rich to lean and back to rich, excessive time will set code 435, HO2S
front slow to respond.
EFI-436; the ECM monitors the compensation being made by the
rear sensor and sets this code when excessive compensation is being
called for. Note: the front sensor can cause this code to be set in
the rear.
EFI-521 (front), EFI-522 (rear) is set if the ECM detects
excessive or insufficient current in the heating circuits.
ABS Socket (A3)
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111 No DTC set
121 Left front wheel sensor, faulty signal <40 km/h
122 Right front wheel sensor, faulty signal <40 km/h
123 Left rear wheel sensor, faulty signal <40 km/h
124 Right rear wheel sensor, faulty signal <40 km/h
125 Signal faulty from at least one wheel sensor for a long period
135 Control Module faulty
141 Faulty pedal sensor, shorted to ground or supplly
142 Faulty brake pedal switch, open or short
143 Control module faulty
144 Brake discs overheated
151 Left front wheel sensor, open/short to battery
152 Right front wheel sensor, open/short to battery
155 Rear axle sensor open/short to battery
211 Left front wheel sensor, not signal on moving off
212 Right front wheel sensor, no signal on moving off
213 Left rear wheel sensor, no signal on moving off
214 Right rear wheel sensor, no signal on moving off
215 Valve relay, open/short
221 Left front wheel sensor, ABS operation signal missing
222 Right front wheel sensor, ABS operation signal missing
223 Left rear wheel sensor, ABS operation signal missing
224 Right rear wheel sensor, ABS operation signal missing
231 Left front wheel sensor, signal missing
232 Right front wheel sensor, signal missing
235 Rear axle sensor, signal missing
311 Left front wheel sensor, open/short
312 Right front wheel sensor. open/short
313 Left rear wheel sensor, open/short
314 Right rear wheel sensor, open/short
321 Left front wheel sensor, irregular >40 km/h
322 Right front wheel sensor, irregular >40 km/h
323 Left rear wheel sensor, irregular >40 km/h
324 Right rear wheel sensor, irregular >40 km/h
411 Left front wheel inlet valve, open/short
412 Left front wheel return valve, open/short
413 Right front wheel inlet valve, open/short
414 Right front wheel return valve, open/short
415 Rear valve open/short
421 Rear wheel inlet valve circuit, open/short
422 Rear wheel return valve circuit, open/short
423 Traction control system valve, open/short
424 Pressure switch for TRACS, faulty or short circuit
441 Control module faulty
442 Pump pressure low
443 Pump motor, electrical or mechanical fault
444 No power supply to valves in hydraulic unit
Ignition System (Socket A6)
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111 No DTC set
112 Control Module fault
123 Engine Coolant Temperature Sensor (ECT) from Control module
missing or faulty
131 Engine speed (RPM) sensor signal missing
142 Control Module Fault
143 Knock sensor (KS) missing or faulty
144 Ignition control module load signal missing
154 EGR system flow too high in system
214 Engine speed (RPM) sensor signal missing sporadically
224 Engine Coolant Temperature sensor (ECT) signal missing or faulty
234 Throttle Position (TPS) signal missing at idle
241 EGR system flow too low in system
243 Throttle Position sensor (TPS) signal missing at idle
311 Vehicle speed signal missing or faulty
314 Camshaft Position sensor (CMP) signal missing or faulty
324 Camshaft Position sensor (CMP) signal missing sporadically
411 Throttle position sensor (TPS) signal from fuel injection system
missing or faulty
413 EGR temperature sensor signal faulty
432 Control module box temperature too high level 1
433 Knock sensor (KS) signal rar missing or faulty
513 Control module box temperature too high, level 2
