Victor Moses salvaged a point for Wigan at Norwich - but the Latics' poor finishing leaves them rooted to the foot of the Premier League.
Norwich took an early lead through Wes Hoolahan, who volleyed in.
But the Canaries were forced to retreat for much of the game - and the Latics eventually grabbed an equaliser when Victor Moses rounded John Ruddy.
Substitute Mohamed Diame should have earned Wigan a winner but spurned two golden late chances.
Wigan lacked composure at Norwich - Martinez
Wigan boss Roberto Martinez has been bullish about his side's hopes of pulling off a second successive escape, despite still having to travel to Liverpool, Arsenal and Chelsea.
Compounding the tough calendar is a run of form that has now seen them win just one of their last 13 games. And, after Blackburn and Bolton boosted their survival hopes with victories over their relegation rivals on Saturday, Martinez urged his players to "keep the faith".
But the Latics started tentatively and Norwich, now without a win in four - their longest winless streak of the season, pounced on the visitors' insecurity just 10 minutes in.
Jackson squeezed in a cross from the left and Hoolahan sneaked ahead of Latics captain Gary Caldwell to hook in a volley with a well-improvised effort.
Wigan were guilty of being too intricate in attack, but their most fluid first-half moment came when Moses tore down the right wing and cut back to Hugo Rodallega, but the Colombian's shot was clutched by Ruddy.
DID YOU KNOW?
Before today's game, Victor Moses had attempted 72 shots in the Premier League this season but scored only two goals.
The Latics were the better side for long periods but could not convert their pressure into goals, as Rodallega spurned another chance before the break - firing over the bar after Ruddy had spilled Jordi Gomez's stinging effort.
The two sides traded blows early in the second half as Grant Holt's header flashed just wide, moments before James McCarthy waltzed into the box but could only shoot straight at Ruddy.
Substitute Steve Morison almost conjured a second for Norwich moments after coming on, crossing from the right for Jackson, but the Canadian was foiled by a despairing challenge from Antolin Alcarez.
The Latics continued to push forward and, while it remained 1-0, Wigan always looked capable of scoring.
The equaliser came courtesy of Victor Moses. Seizing on a poor goal kick by Ruddy, Wigan worked the ball up to Shaun Maloney, whose perfectly weighted ball put Moses clean through, the forward calmly rounding Ruddy to tap into the empty net.
Lambert refuses to relax until Norwich are safe
It was no less than the Latics deserved for a brave and committed display but, in a relegation scrap, it takes victories to pull teams clear of danger - and Wigan should have won it late on.
After repelling efforts by Norwich's Morison and Elliott Ward, Wigan fashioned a great chance again through Maloney.
The former Celtic and Aston Villa playmaker pulled a cross back to the onrushing Diame, but the Senegalese stabbed his effort into the ground and over the bar.
It was a great chance but Diame had time for another glaring miss, dragging a shot wide after his trickery had put him in a great position.
The performance was one of Wigan's strongest in recent weeks but, still two points from safety, Martinez's side need to be more ruthless to pull off another great escape.
Full Time The final whistle goes and the game is over.
The offside flag is raised against Elliott Bennett. Ali Al Habsi restarts play with the free kick.
Kyle Naughton restarts play with the free kick.
90:00 +4:31 Booking
Booking Caution for James McArthur.
Free kick awarded for an unfair challenge on Wesley Hoolahan by James McArthur.
The official flags Steve Morison offside. Gary Caldwell restarts play with the free kick.
The ball is swung over by David Fox, comfortable save by Ali Al Habsi.
Centre by Anthony Pilkington, Shaun Maloney manages to make a clearance.
Free kick crossed right-footed by David Fox from left wing, clearance made by Gary Caldwell.
90:00 +2:09 Booking
Booking Victor Moses is shown a yellow card for unsporting behaviour.
Adam Drury fouled by Victor Moses, the ref awards a free kick.
Unfair challenge on Gary Caldwell by Steve Morison results in a free kick. Gary Caldwell restarts play with the free kick.
Effort from deep inside the area by Mohamed Diame misses to the right of the target.
The ball is sent over by Victor Moses, Hugo Rodallega has an effort at goal from deep inside the area missing to the left of the goal.
The ball is swung over by Simeon Jackson, Gary Caldwell manages to make a clearance.
The ball is delivered by Maynor Figueroa, comfortable save by John Ruddy.
Anthony Pilkington sends in a cross, Steve Morison takes a shot. Brilliant save by Ali Al Habsi.
Jean Beausejour is flagged offside by the assistant referee. Indirect free kick taken by John Ruddy.
Centre by Shaun Maloney, Effort on goal by Mohamed Diame from inside the area goes harmlessly over the bar.
Substitution James McCarthy leaves the field to be replaced by Mohamed Diame.
Steve Morison crosses the ball, Maynor Figueroa gets a block in. Elliott Bennett takes a outswinging corner from the right by-line played to the near post, clearance made by James McCarthy. The ball is crossed by Elliott Bennett, Elliott Ward has a headed effort at goal from just inside the area that misses to the right of the goal.
The ball is sent over by Anthony Pilkington, blocked by Emmerson Boyce. Corner taken by Anthony Pilkington from the left by-line, Steve Morison takes a shot. Clearance made by Emmerson Boyce.
Anthony Pilkington shoots direct from the free kick.
Booking Antolin Alcaraz receives a caution for unsporting behaviour.
Foul by Antolin Alcaraz on Simeon Jackson, free kick awarded.
Centre by Jean Beausejour. Emmerson Boyce crosses the ball, clearance made by Kyle Naughton.
Free kick crossed right-footed by David Fox, clearance made by Emmerson Boyce.
Booking James McCarthy booked.
Free kick awarded for an unfair challenge on Elliott Bennett by James McCarthy.
James McArthur takes a shot. Elliott Ward makes a clearance.
Victor Moses delivers the ball, Kyle Naughton manages to make a clearance.
Emmerson Boyce fouled by Anthony Pilkington, the ref awards a free kick. Free kick taken by James McArthur.
Effort from inside the area by Simeon Jackson misses to the left of the goal.
The ball is swung over by Adam Drury, clearance by Jean Beausejour.
The ball is sent over by Victor Moses, Header from deep inside the area by Hugo Rodallega goes over the bar.
Gary Caldwell restarts play with the free kick.
Booking Adam Drury is given a yellow card.
Adam Drury challenges Victor Moses unfairly and gives away a free kick.
Substitution Anthony Pilkington on for Andrew Surman.
Substitution Elliott Bennett comes on in place of Andrew Crofts.
Assist by Shaun Maloney.
67:39 Goal scored
Goal! - Victor Moses - Norwich 1 - 1 Wigan Victor Moses scores a goal from inside the area low into the middle of the goal. Norwich 1-1 Wigan.
Jean Beausejour sends in a cross, Andrew Crofts gets a block in. Outswinging corner taken from the left by-line by Jean Beausejour.
Jean Beausejour sends in a cross, Zak Whitbread makes a clearance.
Emmerson Boyce produces a cross.
Victor Moses takes a outswinging corner from the right by-line played to the near post, Shaun Maloney takes a shot. Save made by John Ruddy. Outswinging corner taken by Victor Moses from the right by-line, Adam Drury makes a clearance.
The ball is swung over by Steve Morison, Antolin Alcaraz gets a block in.
A cross is delivered by Jean Beausejour, David Fox makes a clearance.
Emmerson Boyce crosses the ball, Antolin Alcaraz produces a header from inside the area that goes over the bar.
The ball is swung over by James McCarthy, Zak Whitbread makes a clearance.
The free kick is delivered left-footed by Jean Beausejour from right channel. Inswinging corner taken from the left by-line by Shaun Maloney, clearance by Elliott Ward.
Booking Zak Whitbread goes into the referee's book.
Zak Whitbread challenges Hugo Rodallega unfairly and gives away a free kick.
Simeon Jackson takes a shot from 25 yards. Blocked by Gary Caldwell.
Elliott Ward takes the direct free kick.
Substitution Grant Holt goes off and Steve Morison comes on.
Shaun Maloney is penalised for a handball.
Maynor Figueroa has an effort at goal from a long way out that misses to the right of the goal.
A cross is delivered by Jean Beausejour.
Substitution Jordi Gomez leaves the field to be replaced by Shaun Maloney.
Booking Booking for Wesley Hoolahan for unsporting behaviour.
Free kick awarded for an unfair challenge on Jordi Gomez by David Fox. Direct free kick taken by Jordi Gomez. Unfair challenge on Wesley Hoolahan by Maynor Figueroa results in a free kick. Direct free kick taken by Grant Holt.
Zak Whitbread sends in a cross, Ali Al Habsi makes a comfortable save.
James McCarthy takes a shot. Save by John Ruddy.
A cross is delivered by Adam Drury, Header by Grant Holt from deep inside the penalty area misses to the left of the target.
Victor Moses produces a cross.
The match restarts for the second half.
45:00 +2:11 Half time
Half Time The referee calls an end to the first half.
The ball is delivered by James McArthur, clearance made by Elliott Ward.
Jean Beausejour delivers the ball, Andrew Crofts gets a block in.
Shot by Hugo Rodallega. Save made by John Ruddy.
David Fox sends in a cross, clearance by Gary Caldwell.
A cross is delivered by Grant Holt, Antolin Alcaraz makes a clearance.
Simeon Jackson takes a shot from just inside the penalty box which clears the crossbar.
James McCarthy fouled by Simeon Jackson, the ref awards a free kick. James McCarthy restarts play with the free kick.
Gary Caldwell restarts play with the free kick.
Booking Grant Holt is cautioned by the ref for unsporting behaviour.
Free kick awarded for a foul by Grant Holt on Gary Caldwell.
Jordi Gomez produces a drilled left-footed shot from 25 yards. Save by John Ruddy. Hugo Rodallega takes a shot from inside the six-yard box clearing the crossbar.
Jordi Gomez has an effort at goal from outside the area missing to the wide right of the target.
Unfair challenge on Victor Moses by Adam Drury results in a free kick. Victor Moses takes the free kick.
Simeon Jackson delivers the ball, save made by Ali Al Habsi.
Unfair challenge on Wesley Hoolahan by Antolin Alcaraz results in a free kick. Wesley Hoolahan takes the direct free kick. Wesley Hoolahan takes a shot. Blocked by Gary Caldwell.
The ball is delivered by Kyle Naughton, Maynor Figueroa makes a clearance.
James McCarthy takes a shot. Zak Whitbread gets a block in.
The ball is swung over by Emmerson Boyce, Andrew Crofts gets a block in. Short corner taken by Jean Beausejour.
Grant Holt takes a shot. Antolin Alcaraz gets a block in.
The ball is crossed by Emmerson Boyce, save made by John Ruddy.
The ball is swung over by James McArthur.
Simeon Jackson gives away a free kick for an unfair challenge on Antolin Alcaraz. Antolin Alcaraz restarts play with the free kick.
Centre by Victor Moses, Hugo Rodallega takes a shot. John Ruddy makes a comfortable save.
The ball is sent over by Jean Beausejour.
Simeon Jackson has an effort at goal from outside the area which goes wide right of the goal.
A cross is delivered by Jean Beausejour, Adam Drury manages to make a clearance.
Zak Whitbread gives away a free kick for an unfair challenge on Jordi Gomez. Direct free kick taken by Antolin Alcaraz.
Victor Moses delivers the ball.
A cross is delivered by Jean Beausejour, Kyle Naughton gets a block in.
Jean Beausejour takes a shot. Save by John Ruddy. Wesley Hoolahan produces a cross. Effort on goal by Andrew Crofts from outside the area goes harmlessly over the bar.
The ball is sent over by Adam Drury.
The ball is crossed by Grant Holt.
Foul by Andrew Surman on James McArthur, free kick awarded. Free kick crossed left-footed by Jordi Gomez, comfortable save by John Ruddy.
Centre by Simeon Jackson, blocked by Gary Caldwell. Corner taken right-footed by David Fox, clearance made by Emmerson Boyce.
Free kick awarded for a foul by Gary Caldwell on Wesley Hoolahan. Free kick taken by David Fox.
Assist on the goal came from Simeon Jackson.
9:37 Goal scored
Goal! - Wesley Hoolahan - Norwich 1 - 0 Wigan Wesley Hoolahan scores a goal from close range to the top right corner of the goal. Norwich 1-0 Wigan.
Simeon Jackson delivers the ball,
Simeon Jackson sends in a cross, clearance by Gary Caldwell.
Grant Holt concedes a free kick for a foul on Gary Caldwell. Antolin Alcaraz takes the free kick.
A cross is delivered by Maynor Figueroa, Headed effort on goal by Hugo Rodallega from inside the penalty box misses to the right of the goal.
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