'94 850 P1418 Code

[FinallyGotThatVolvo]

Good Evening everyone,

Well, just got my Volvo running smooth and what do you know, going on a 50 mile ride and CEL comes on. I pull over and pull the code P1418 it is. I turn off/on the car to reset it and drive, the code pops back on again.
Made it home, checked on the OBD-1 and the code read 4-1-3.
Can't find too much on the code here on the forum and was wondering if anyone has dealt with this in the past.

Recently I've changed my starter and might've mucked around with the EGR. I tend to mess with things that I have no business touching mainly because I don't know what I'm doing .

Thanks for any help.

[abscate]

Yeah, that's an EGR code. I don't know too much.p About this so let the folks who do chime in.

Welcome to the madness!!

[Ozark Lee]

It is an EGR Temperature code. I have had that one pop up when the EGR flow is restricted due to the hole in the bottom of the intake manifold being clogged.

Here is the book procedure to sort it out but it references the use of a Volvo Scan Tool which few if any of us have.

Code 4-1-3 (EGR Temperature Sensor Signal)

1) Check for any other codes. If Code 1-5-4 is present,
perform testing for that code first. If no other codes are present, go
to next step.

2) Using Volvo Scan Tool (998-8686), check code status
message. If SIGNAL TOO HIGH is displayed, go to next step. If SIGNAL
TOO LOW is displayed, go to step 13). If FAULTY SIGNAL is displayed,
go to step 16).

3) If SIGNAL TOO HIGH is displayed, turn ignition on. Using
Volvo Scan Tool, use Diagnostic Test Mode (DTM) No. 3 to check if EGR
controller functions. If EGR controller functions, go to next step. If
EGR controller does not function, go to step 7).

4) Turn ignition off. Disconnect wire from EGR controller
connector terminal No. 2. Connect jumper wire to free end of
disconnected wire. Start and run engine at idle. Connect other end of
jumper wire to ground. If engine runs unevenly at idle, go to next
step. If engine does not run unevenly, check vacuum in EGR controller.
See CODE 2-4-1 (EGR SYSTEM FLOW MALFUNCTION).

5) Run engine at idle. Connect free wire at EGR temperature
sensor to ground. Using Volvo Scan Tool (998-8686), observe voltage at
EGR temperature sensor. If voltage drops when engine runs unevenly, go
to step 17). If voltage does not drop when engine runs unevenly, go to
next step.

6) Turn ignition off. Disconnect EGR temperature sensor. Turn
ignition on. Connect voltmeter between EGR temperature sensor
connector terminal No. 2 and ground. If voltmeter reads zero volts, go
to next step. Repair as necessary. If voltmeter does not read zero
volts, check wire between EGR temperature sensor connector terminal
No. 2 and ECM terminal A18 for a short to voltage.

7) Turn ignition off. Wait about 2 minutes. Disconnect EGR
temperature sensor. Connect an ohmmeter between EGR temperature sensor
connector terminal No. 2 and ground. If ohmmeter reads about zero
ohms, go to step 9). If ohmmeter does not read about zero ohms, go to
next step.

Turn ignition off. Disconnect EGR temperature sensor
connector. Ensure connector terminals are clean and tight. Repair as
necessary. Reconnect EGR temperature sensor connector. Connect an
ohmmeter between EGR temperature sensor connector terminal No. 2 and
ground. If ohmmeter reads about zero ohms, code is caused by poor
contact in ECM connector. If ohmmeter does not read about zero ohms,
check wiring between EGR temperature sensor connector terminal No. 2
and ECM terminal A18 for an open circuit.

9) Turn ignition on. Disconnect EGR temperature sensor
connector. Connect voltmeter between EGR temperature sensor connector
terminal No. 1 and ground. If voltmeter reads about 5 volts, go to
step 11). If voltmeter reads less than 5 volts, go to next step. If
voltmeter reads greater than 5 volts, check wiring between EGR
temperature sensor connector terminal No. 1 and ECM terminal A35 for ashort circuit to voltage, then go to step 12).

10) Turn ignition off. Disconnect EGR temperature sensor.
Ensure connector terminals are clean and tight. Repair as necessary.
Reconnect connector. Turn ignition on. Connect voltmeter between EGR
temperature sensor connector terminal No. 1 and ground. If voltmeter
reads about 5 volts, code was caused by poor contact in ECM connector.
If voltmeter does not read about 5 volts, check wiring between EGR
temperature sensor connector terminal No. 1 and ECM terminal A35 for
an open circuit.

11) Turn ignition off. Disconnect EGR temperature sensor
connector. Connect an ohmmeter between EGR connector terminals No. 1
and 2. If ohmmeter reads about 200 k/ohms, cause of code was poor
contact in EGR temperature sensor connector. Repair as necessary. If
about 200 k/ohms are not present, retest using new EGR temperature
sensor.

12) EGR temperature sensor may give defective reading due to
signal wiring shorting to voltage. To check, turn ignition off.
Disconnect EGR temperature sensor. Connect an ohmmeter between EGR
temperature sensor connector terminals No. 1 and 2. If ohmmeter reads
about 200 k/ohms, EGR temperature sensor is okay. If ohmmeter does not
read about 200 k/ohms, retest using new EGR temperature sensor.

13) If signal is too low, start engine and run at idle. Using
Volvo Scan Tool (998-8686), check voltage at EGR temperature sensor.
If voltage is greater than .1 volt, go to step 18). If voltage is not
greater than .1 volt, go to next step.

14) Turn ignition off. Disconnect EGR temperature sensor
connector. Start engine and run at idle. Using Volvo Scan Tool (998-
8686), read off EGR temperature sensor signal. If reading is about 5
volts, go to next step. If reading is not about 5 volts, check wiring
between EGR temperature sensor connector terminal No. 1 and ECM
terminal A35 for a short circuit to ground.

15) Turn ignition off. Disconnect EGR temperature sensor
connector. Connect an ohmmeter between EGR temperature sensor
connector terminals No. 1 and 2. If ohmmeter reads about 200 k/ohms,
cause of code is poor contact in EGR temperature sensor connector.
Repair as necessary. If ohmmeter does not read about 200 k/ohms,
retest using new EGR temperature sensor.

16) Check EGR temperature sensor and ECM connector terminals
for signs of loose connection or poor contact. Repair as necessary.
Check wiring between EGR temperature sensor connector terminal No. 1
and ECM terminal A35 for an intermittent open circuit, short circuit
to ground, or short circuit to voltage. Also check wiring between EGR
temperature connector terminal No. 2 and ECM terminal A18 for an
intermittent open circuit. Repair as necessary.

17) If fault is intermittent and signal is too high, check
EGR temperature sensor connector for signs of loose connection or poor
contact. Repair as necessary. Check wiring between EGR temperature
sensor connector terminal No. 1 and ECM terminal A35 for an
intermittent open circuit or short circuit to voltage. Also check
wiring between EGR temperature sensor connector terminal No. 2 and ECM
terminal A18 for an intermittent open circuit.

18) If fault is intermittent and signal is too low, check
wiring between EGR temperature sensor connector terminal No. 1 and ECM
terminal A35 for an intermittent short circuit to ground.

...Lee

[FinallyGotThatVolvo]

Thank you for that!
I will give it a try tonight once I get home and update everyone.

[FinallyGotThatVolvo]

First off, thank you for your all your help Ozark and Absacate.
Now, this error was COMPLETELY my fault.
I went to check out the EGR valve and I saw that the EGR sensor connector had fallen off, probably happened when I replaced the starter.
I ordered a new sensor from Ebay replaced it it and after 75 miles of driving no CEL.