Volvo C70 2.3L Turbo – S90/V90 2.9L Turbo – V70 2.3L Turbo (1997 – 1998) OBD1 Codes

Model	Year	Engine identification	System
C70 2.3L Turbo	1998	B5234T3	Bosch Motronic 4.4
S90/V90 2.9L Turbo	1997-98	B6304FS2
V70 2.3L Turbo	1998	B5234T3/T6

General information

Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.

Accessing

Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC):

o C70/V70 [1].
o S/V90 [2].

Erasing

Trouble codes can only be erased by using a Scan Tool connected to the data link connector (DLC).

Trouble code identification

Scan code Volvo type	OBD·II code	Fault location	Probable cause
–	PO, P2, uo	Refer to OBD-11 trouble code tables	–
EFI-112	P1326	Engine control module (ECM) – malfunction	ECM
EFI-112	P1327	Engine control module (ECM) – malfunction	ECM
EFI-112	P1328	Engine control module (ECM) – malfunction	ECM
EFI-112	P1329	Engine control module (ECM) – malfunction	ECM
EFI-112	P1401	Engine control module (ECM) – malfunction	ECM
EFI-112	P1403	Engine control module (ECM) – malfunction	ECM
EFI-112	P1404	Engine control module (ECM) – malfunction	ECM
EFI-115	–	Injector 1	Wiring, injector
EFI-121	–	Mass air flow (MAF) sensor	Intake leak/blockage, hose leak, wiring, MAF sensor
EFI-123	–	Engine coolant temperature (ECT) sensor	Wiring, ECT sensor
EFI-125	–	Injector 2	Wiring, injector
EFI-131	–	Crankshaft position (CKP) sensor/engine speed (RPM) sensor – no signal	Wiring, CKP/RPM sensor
EFI-132	–	Engine control module (ECM) – supply voltage	Battery, alternator, wiring
EFI-135	–	Injector 3	Wiring, injector
EFI-143	–	Knock sensor (KS) 1	Wiring, KS
EFI-145	–	Injector 4	Wiring, injector
EFI-153	–	Heated oxygen sensor (H02S) 2	Exhaust leak, wiring, H02S 1/2
EFI-155	–	Injector 5	Wiring, injector
EFI-165	–	Injector 6	Wiring, injector
EFI-212	–	Heated oxygen sensor (H02S) 1	Wiring, H02S 1/2
EFI-214	–	Crankshaft position (CKP) sensor/engine speed (RPM) sensor- incorrect/ intermittent signal	Poor connection, shield wiring, flywheel/drive plate damaged, CKP/RPM sensor
EFI-223	P1505	Idle air control (lAC) valve – opening signal	Wiring, lAC valve
EFI-223	P1506	Idle air control (lAC) valve – opening signal	Wiring, lAC valve
EFI-225	–	A/C refrigerant pressure sensor	Wiring, A/C refrigerant pressure sensor
EFI-231	–	Long term fuel trim, part load	Intake/exhaust leak, fuel pressure, excessive fuel in engine oil, engine oil level too high, injector(s), EVAP canister purge valve, wiring, MAF sensor, ECT sensor, H02S
EFI-232	–	Long term fuel trim, idling	Intake/exhaust leak, fuel pressure, excessive fuel in engine oil, engine oil level too high, injector(s), EVAP canister purge valve, wiring, MAF sensor, ECT sensor, H02S
EFI-233	–	Long term fuel trim, idle air adjustment	Intake leak/blockage, throttle valve adjustment, accelerator cable adjustment, wiring, lAC valve
EFI-242	–	Turbocharger (TC) wastegate regulating valve	Wiring, TC wastegate regulating valve
EFI-245	P1507	Idle air control (lAC) valve – closing signal	Wiring, lAC valve
EFI-245	P1508	Idle air control (lAC) valve – closing signal	Wiring, lAC valve
EFI-311	–	Vehicle speed signal	Wiring, speedometer
EFI-314	–	Camshaft position (CMP) sensor	Wiring, poor connection, CMP sensor
EFI-315	–	Evaporative emission (EVAP) canister purge valve – leak detected	EVAP canister purge valve
EFI-335	P1617	Transmission control module (TCM) – MIL ON request	Wiring
EFI-335	P1618	Transmission control module (TCM) – MIL ON request	Wiring
EFI-411	–	Throttle position (TP) sensor	Wiring, TP sensor
EFI-414	–	Turbocharger (TC) boost pressure – control	Hose blocked, TCM wire (TC boost pressure reduction signal), wiring, MAF sensor, TC wastegate actuator/ regulating valve
EFI-422	–	Barometric pressure (BARO) sensor	Wiring, sensor supply, BARO sensor, AIC pressure sensor, fuel tank pressure sensor, G-force sensor
EFI-425	–	Heated oxygen sensor (H02S) 2	Intake/exhaust leak, uneven compression, fuel pressure, H02S
EFI-432	P1406	Engine control module (ECM) – overhea ing	Engine coolant blower motor, air supply blocked
EFI-433	–	Knock sensor (KS) 2	Wiring, KS
EFI-435	–	Heated oxygen sensor (H02S) 1 – slow response	Intake/exhaust leak, uneven compression, fuel pressure, MAF sensor, heating inoperative, H02S
EFI-436	–	Heated oxygen sensor (H02S) 2 – compensation	Intake/exhaust leak, uneven compression, fuel pressure,. H02S 1/2
EFI-443	–	Catalytic converter – efficiency below threshold	Intake/exhaust leak, uneven compression, fuel pressure, catalytic converter
EFI-444	P1307	G-force sensor – signal low	Wiring short to ground, G-force sensor
EFI-444	P1308	G-force sensor – signal high	Wiring, sensor supply, AJC pressure sensor, fuel tank pressure sensor, G-force sensor
EFI-445	–	Pulsed secondary air injection (PAIR) pump relay	Wiring, PAIR pump relay
EFI-446	–	Pulsed secondary air injection (PAIR) valve – leak detected	PAIR valve/solenoid, exhaust leak
EFI-447	–	Pulsed secondary air injection (PAIR) solenoid	Wiring, PAIR solenoid
EFI-448	–	Pulsed secondary air injection (PAIR) system – incorrect flow detected	PAIR valve/solenoid, PAIR pump/relay, hoses/pipes blocked, exhaust leak, PAIR pump wiring
EFI-451	–	Cylinder 1 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-452	–	Cylinder 2 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-453	–	Cylinder 3 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-454	–	Cylinder 4 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-455	–	Cylinder 5 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket,
EFI-455	–	Cylinder 5 – misfire detected	low-tension wiring, repeated cold starts (flooding)
EFI-456	–	Cylinder 6 – misfire detected	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-514	P1619	Engine coolant blower motor relay, low speed	Wiring, engine coolant blower motor relay
EFI-514	P1620	Engine coolant blower motor relay, low speed	Wiring, engine coolant blower motor relay
EFI-521	–	Heated oxygen sensor (H02S) 1 – heater control	Wiring, H02S
EFI-522	–	Heated oxygen sensor (H02S) 2- heater control	Wiring, H02S
EFI-532	P1602	Engine control module (ECM) – power stage – group B	Wiring, lAC valve, TC wastegate regulating valve, engine coolant blower motor relay, ECM
EFI-533	P1603	Engine control module (ECM) – power stage – group C	Wiring short circuit at terminal 819, ECM
EFI-534	P1604	Engine control module (ECM) – power stage – group D	Wiring short to positive, MIL, engine coolant blower motor relay, fuel pump, ignition coil/amplifier, TCM (load signal), ECM
EFI-535	P1605	Engine control module (ECM) – power stage – group E	Wiring short to positive, AIC relay/PAIR pump relay, ECM
EFI-541	–	Evaporative emission (EVAP) canister purge valve – signal	Wiring, EVAP canister purge valve
EFI-543	–	Misfire detected, at least 1 cylinder	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket,
EFI-543	–	Misfire detected, at least 1 cylinder	low-tension wiring, repeated cold starts (flooding)
EFI-545	–	Misfire detected – at least 1 cylinder – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-551	–	Cylinder 1, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-552	–	Cylinder 2, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-553	–	Cylinder 3, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-554	–	Cylinder 4, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts
EFI-555	–	Cylinder 5, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-556	–	Cylinder 6, misfire detected – TWC damage	Spark plug, HT lead, distributor rotor/ cap, moisture ingress, injector/wiring, air leak, compression, head gasket, low-tension wiring, repeated cold starts (flooding)
EFI-621	–	Fuel tank pressure sensor	Wiring, sensor supply, G-force sensor, A/C pressure sensor, fuel tank pressure sensor
EFI-666	P1621	Transmission control module (TCM) – access fault memory	Trouble code(s) stored