Work step: 9 Diagnostic test: Oxygen Sensor (O2S) aging (regulating frequency extended)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen GTI, 1998 Volkswagen Jetta, 1998 Volkswagen GTI, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Vehicle stationary

Display will appear as shown

Fig 1: Identifying Scan Tool Display - Function 15, Work Step 9 (1 Of 2)

Press buttons -1-, -3- and -0- to input display group 130.
Press -Q- button to enter input.

Display will appear as shown (1 to 4 = display fields)

Fig 2: Identifying Scan Tool Display - Function 15, Work Step 9 (2 Of 2)

Raise engine RPM between 2500 and 3500 for 20 seconds, then check specifications.

DISPLAY GROUP: 130, FUNCTION: 04

Display fields

Display group: 130, Function: 04

Display

xxxx rpm

xx secs.

xxxx xxxx

Indicated

Engine speed

Seconds

Period counter

Diagnostic conditions

Specification

2500 to 3500 rpm

0 to 2 secs.

10⁽¹⁾

1111 x100

O2S control duration (one complete cycle)

HO2S slopes recognized (requires 6 slopes)

x = Not relevant

Working range

650 to 5500 rpm

0 to 3 secs.

⁽¹⁾	This display field represents the average of six oxygen sensor cycles from rich to lean; there must be a total of six.

RELEVANCE OF 8 DIGIT NUMBER BLOCK IN DISPLAY FIELD 4

Relevance of 8 digit number block in display field 4
1	2	3	4	5	6	7	8	Specifications of diagnostic conditions
1								Oxygen sensor control before TWC active
	1							TWC has its minimum temperature
		1						Load range OK
			1					HO2S after TWC operationally ready
					1			CYCLE Bit = Diagnosis completed
						0		Diagnosis malfunction free
							0	DTC memory malfunction free